Death rate in the context of "Population ecology"

Demographic features of the population of Lithuania include population density, ethnicity, level of education, health, economic status, and religious affiliations.

The population of Lithuania increased after the end of World War II, reaching its apex in 1991 with 3.7 million, but started to decline after the Dissolution of the Soviet Union later that year, which negatively impacted the country. As social problems ensued after the dissolution of the Soviet Union, the birth rate decreased and the population fell sharply due to a relatively high death rate, mass emigration and a large increase of its suicide rate that made Lithuania one of the countries with the highest suicide rates in the world. This caused its population to drop below 3 million in 2012, losing over a quarter of its population in 30 years. As of today, Lithuania's fertility rate is one of the lowest in the world. However, while its suicide rate would remain the highest in the European Union, it dropped over time, and in the 2020's, the Lithuanian population would return to grow slightly due to immigration and a decreasing death rate.

The demographics of Nauru, an island country in the Pacific Ocean, are known through national censuses, which have been analysed by various statistical bureaus since the 1920s. The Nauru Bureau of Statistics have conducted this task since 1977—the first census since Nauru gained independence in 1968. The most recent census of Nauru was on 30 October 2021, when population had reached 11,680 people. The population density is 554 inhabitants per square kilometre (1,430 inhabitants/sq mi), and the overall life expectancy is 63.9 years. The population rose steadily from the 1960s until 2006 when the Government of Nauru repatriated thousands of Tuvaluan and I-Kiribati workers from the country. Since 1992, Nauru's birth rate has exceeded its death rate; the natural growth rate is positive. In terms of age structure, the population is dominated by the 15–59-year-old segment (57%). The median age of the population is 21.6, and the estimated gender ratio of the population is 101.8 males per 100 females.

Nauru is inhabited mostly by Nauruans (92.1%), while minorities include those from Kiribati (2.4%), Fiji (2.2%), Australia (1.2%) and other (2.1%). The demographic history of Nauru is marked by several migrations: the area was first inhabited by Micronesian people about 3,000 years ago. The first European to find the island was John Fearn in 1798. Then, the country was annexed by Germany in 1888. The next major population change was when Japanese occupied the island during World War II in 1942. During this time, the Japanese deported several thousands of Nauruans to other islands. In the 1960s, the country gained independence, where the percentage of Nauruans started to increase. The most recent demographic switch was in the 2000s, when the government repatriated several groups of non-Nauruans from the country.

The demographic characteristics of the population of Croatia are known through censuses, normally conducted in ten-year intervals and analysed by various statistical bureaus since the 1850s. The Croatian Bureau of Statistics has performed this task since the 1990s. The latest census in Croatia was performed in autumn of 2021. According to final results published on 22 September 2022 the permanent population of Croatia at the 2021 census (31st Aug) stood at 3.87 million. The population density is 68.7 inhabitants per square kilometre, and the overall life expectancy in Croatia at birth was 78,2 years in 2018. The population rose steadily (with the exception of censuses taken following the two world wars) from 2.1 million in 1857 until 1991, when it peaked at 4.7 million. Since 1991, Croatia's death rate has continuously exceeded its birth rate; the natural growth rate of the population is negative. This population drop is also caused by emigration rates. Because of this, Croatia's population fell below 4 million again in 2018, and the apex of its mass emigration occurred in 2022, while population didn't increase again until 2023 due to immigration compensating for the negative natural change. Croatia is in the fourth (or fifth) stage of the demographic transition. In terms of age structure, the population is dominated by the 15 to 64 year‑old segment. The median age of the population is 43.4, and the gender ratio of the total population is 0.93 males per 1 female.

Croatia is inhabited mostly by Croats (91.63%), while minorities include Serbs (3.2%), and 21 other ethnicities (less than 1% each). The demographic history of Croatia is marked by significant migrations, including the arrival of the Croats in the area growth of Hungarian and German-speaking population since the union of Croatia and Hungary, and joining of the Habsburg Empire, migrations set off by Ottoman conquests and growth of Italian speaking population in Istria and in Dalmatia during Venetian rule there. After the collapse of Austria-Hungary, the Hungarian population declined, while the German-speaking population was forced or compelled to leave after World War II and similar fate was suffered by the Italian population. Late 19th century and the 20th century were marked by large scale economic migrations abroad. The 1940s and the 1950s in Yugoslavia were marked by internal migrations in Yugoslavia, as well as by urbanisation. Recently, significant migrations came as a result of the Croatian War of Independence when hundreds of thousands were displaced, while the 2010s brought a new wave of emigration which strengthened after Croatia's accession to the EU in 2013.

The demographics of North Korea are determined through national censuses and international estimates. The Central Bureau of Statistics of North Korea conducted the most recent census in 2008, where the population reached 24 million inhabitants. The population density is 199.54 inhabitants per square kilometre, and the 2014 estimated life expectancy is 69.81 years. In 1980, the population rose at a near consistent, but low, rate (0.84% from the two censuses). Since 2000, North Korea's birth rate has exceeded its death rate; the natural growth is positive. In terms of age structure, the population is dominated by the 15–64-year-old segment (68.09%). The median age of the population is 32.9 years, and the gender ratio is 0.95 males to 1.00 female. Since the early 1990s, the birth rate has been fairly stable, with an average of 2 children per woman, down from an average of 3 in the early 1980s.

According to The World Factbook, North Korea is racially homogeneous and contains a small Chinese community and a few ethnic Japanese. The 2008 census listed two ethnicities: Korean (99.998%) and Other (0.002%). Korea was annexed by the Empire of Japan in 1910, in which the Korean Peninsula was occupied by Japanese. In 1945, when Japan was defeated in World War II, Korea was divided into two occupied zones: north occupied by the Soviet Union and the south by the United States. Negotiations on unification failed, and in 1948 two separate countries were formed: North and South Korea.