INSIDER Data found the 30 countries and territories with the biggest population shifts since 1950.

The United Arab Emirates had the most population growth on average, while Niue had the least.

Many of the shifts were due to job booms and busts, refugee crises, and varying birth rates.

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In 1950, the global population hit 2.5 billion.

Today, there are 7.7 billion people in the world, and with refugee crises, wars, droughts, and changing work opportunities, populations in some countries are booming while others are shrinking.

INSIDER Data found the 15 countries with the biggest population growth since 1950, and the 15 countries with the least population growth since 1950. Here are the results.