Data: Average IQ of whites fell one-half point over the past decade

In the last post, we saw saw that Mexican Americans born in the US had a mean IQ that rose from the 1980s to the 2000s, but reversed course since then.  It is currently 91.5. 

That made me curious about other American groups.  Let's start with all whites over the past four decades (GSS Wordsum measure, N = 20, 482):

Mean IQ for whites

1970s    99.2
1980s    99.3 
1990s  100.4
2000s  101.1
2010s  100.6

As we saw with Mex-Ams, whites peaked in the 2000s, but then IQ's dropped in the past decade -- one-half a point.

This is consistent with Greg Cochran's claim that the US is undergoing rapid change in genetic potential for IQ due to intelligent people having fewer offspring.  It might be decreasing one point per generation.