All immigrants (inbound immigrants) are also immigrants in their own country (incoming immigrants). However, even on a global scale, the amount of information representative of a specific population available in a specific country/region is generally of lower quality than the quality of immigrants. Considering that the former is different from the latter, they are no longer residents and no longer use government-funded public services or infrastructure. Therefore, compared with immigrants, countries may not be so worried about the count of immigrants.
According to United Nations data, there were 258 million immigrants in 2017, which is only a small part (3.4%) of the world’s population; the vast majority live in the country of birth. In recent decades, the proportion of immigrants has increased only slightly (30 years ago, 2.9% in 1990, 55 years ago, 2.3% in 1965). In 100 years, it may have changed only slightly.
However, the distribution of immigrants is different from a century ago. In the words of Alfred Sauvy, one change is the “reversal of migration flow” between the North and the South, and now a considerable part of international migrants come from the South.
HERE IS A LIST OF THE TOP 10 MIGRANT SENDING COUNTRIES:
However, immigrants often remit money to make a significant contribution to their home country’s economy. In some cases, they still have the right of voting. This is a good reason for sending countries to track their immigrant population more effectively. Statistical sources are another reason for the poor quality of immigration data. The arrival of immigrants is better than the departure. The number of immigrants is usually estimated based on the immigration statistics of different host countries.
The number of immigrants from one country to another varies greatly. In 2015, India was at the top of the list. Nearly 16 million people were born in that country, but they lived in another country (see the picture below); Mexico came in second, with more than 12 million immigrants mainly living in the United States.