Analysts in China have called for more measures to stop the outflow of talents and wealth Chinese after a US study claimed that about 22 million people in China want to leave for the United States permanently. The findings by Gallup showed that about 13 percent of the world\'s adults - or more than 640 million people - say they would like to leave their country permanently. The US is the most desired destination for worldwide potential emigrants, and about 23 percent of them, or roughly 150 million people, want to move there, including 22 million from China, followed by Nigeria with 15 million and India with 10 million. According to the Gallup website, the results are based on aggregated telephone and face-to-face interviews with 452,199 people, aged 15 and older, in 151 countries and regions from 2009 to 2011. Statistics from the US government showed that Chinese immigrant numbers to the country are rising. In 2011, the world\'s largest economy, with a per capita GDP of $48,100, granted green cards to more than 1.06 million immigrants. Among them, 87,000 were from China, 16,000 more than in 2010. According to the Gallup survey, the primary reason for choosing the US is its society\'s openness to immigrants, followed by other reasons such as opportunities to join family members or to start a new business.