by Dan | Apr 23, 2019 | Analysis
According to the US Census Bureau (https://en.wikipedia.orglvviki/United_States_Census_Bureau): • 1970(https://en.wikipedia.org/wiki/1970): 0.394 • 1980(https://en.wikipedia.org/wiki/1980): 0.403 • 1990(https://en.wikipedia.org/wiki/1990): 0.428 •...