The report, World Population Prospects 2019: A Summary of Findings, says that between now and 2050, Half of the world's new population will be concentrated in India, Nigeria, Pakistan, the Democratic Republic of the Congo, Ethiopia, Tanzania, Indonesia, Egypt, and the United States.
India is expected to have a larger population than China around 2027, making it the world's largest population.
The report found that world population growth was slowing and more countries were contracting. Between now and 2050, the number of countries or areas with shrinking populations will increase to 55, of which 26 countries or areas will have more than 10 shrinking populations.
According to the report, the global average fertility rate for women has risen from 3 in 1990. 2 dropped to 2 now. Five. By 2050, the global average fertility rate for women will continue to decline to 2. Two.
The report argues that the ageing of the world's population is increasing and that the population aged 65 and over will be the fastest growing age group. At present, about 9 % of the world's population is over 65 years old, and by 2050 this proportion will reach 16 %. By then, the population aged 65 and above in Europe and North America will account for 1/4 of the total population. The world's population aged 80 and over will be from the current 1. 43 billion to 4. 2.6 billion. According to the report, the ageing of the population has led to a decline in the proportion of the working age population, which will increase the pressure on social security.
The report states that by 2050, the average human life expectancy will be 72 years from the current level. The age of 6 increased to 77. 1 year old. Regional inequalities in life expectancy have improved, but the average life expectancy of the population in the least developed countries is still 7 times lower than the world average. 4 years old.
Migration is also the main cause of population change.
According to the latest report, migration is also a major cause of population growth or decline in some countries.
Between 2010 and 2020, 14 countries or regions will have a net inflow of more than 1 million immigrants; The population of 10 countries will be reduced by about 1 million.
According to the report, some of the countries with the largest outflows, including Bangladesh, Nepal and the Philippines, are mainly due to higher demand for workers from these countries elsewhere. But some migrants, including those from Myanmar, Syria and Venezuela, have been displaced by violence, insecurity and conflict.
The United Nations says net migration over the decade 2010-2020 includes Belarus, Estonia, Germany, Hungary, Italy, Japan, Russia, Serbia and Ukraine.
Top 10 countries in the world population in 2019
As of January 17, 2019, the total population of 230 countries in the world was 7,577,908,055, of which China ranked first with 1,394,102,196 people, becoming the most populous country in the world, India with 1,354,051, 854 people ranked second in the world and third to tenth in the world: United States, Indonesia, Brazil, Pakistan, Nigeria, Bangladesh, Russia, etc..