美国近五年人口多少？
The 2014 American Community Survey shows that the United States lost nearly two million people to domestic migration between 2013 and 2014. Of those who moved， about one-quarter (26 percent) were younger adults ages 18 to 34， while another 27 percent were retirees over age 65. Approximately 9 percent of domestic migrants came from California， with New York and Texas following close behind. Those three states accounted for almost half (47 percent) of U.S. residents who moved domestically in 2013–2014.
International immigration remained strong during this period， with an estimated 591，000 immigrants entering the country annually on average．And the 2014 ACS estimates that there are now more than 41.5 million immigrant—or foreign born—residents in the United States， representing 13% of the total population. Nearly four out of ten immigrants live in just five states：California， Florida， New York， Texas和New Jersey.
Source： http：//www.census.gov/prod/2015pubs/acs-25.pdf