Ask HN: Stats on People Leaving Software Engineering

I was reading https://www.nytimes.com/1998/01/26/opinion/now-hiring-if-you-re-young.html which claims that:

According to a survey conducted by the National Science Foundation and the Census Bureau, six years after finishing college, 57 percent of computer science graduates are working as programmers; at 15 years the figure drops to 34 percent, and at 20 years -- when most are still only in their early 40's -- it is down to 19 percent.

I can't seem to find the original survey, does anybody have any idea where I could find it?

Also, since this story is from 1998, does anybody know of any more recent figures like these?