> In the mid-1960s, about 20 percent of the population moved in any given year, according to the United States Census Bureau. By 1990, it was approaching 15 percent. Today it’s closer to 10 percent. The percentage that moves between states has fallen by nearly half since the early 1990s.
https://www.nytimes.com/2016/05/21/opinion/how-to-get-americ...
Also, https://www.citylab.com/equity/2017/02/american-mobility-has...