Write a question about the following article: Due to economic, social and security developments that are affecting the region in recent decades, the focus is now the change from net immigration to net emigration. About 10 million Mexicans live in the United States. 31.7 million Americans listed their ancestry as Mexican as of 2010, or roughly 10% of the population. According to the 2005 Colombian census or DANE, about 3,331,107 Colombians currently live abroad. The number of Brazilians living overseas is estimated at about 2 million people. An estimated 1.5 to two million Salvadorans reside in the United States. At least 1.5 million Ecuadorians have gone abroad, mainly to the United States and Spain. Approximately 1.5 million Dominicans live abroad, mostly in the United States. More than 1.3 million Cubans live abroad, most of them in the United States. It is estimated that over 800,000 Chileans live abroad, mainly in Argentina, the United States, Canada, Australia and Sweden. An estimated 700,000 Bolivians were living in Argentina as of 2006 and another 33,000 in the United States. Central Americans living abroad in 2005 were 3,314,300, of which 1,128,701 were El Salvador, 685,713 were Guatemalans, 683,520 were Nicaraguans, 414,955 were Hondurans, 215,240 were Panamanians and 127,061 were Costa Ricans.
How many more million Mexicans live in the United States compared to Salvadorans residing in the United States?