According to this BLS report [1] in 1989 the US had 739K "computer and data processing" jobs. By 1999 it was 1830K. Wikipedia say there were nearly 21M "software developers" by 2016 [2]. I'm pretty sure our industry hasn't gotten any smaller so, basically, we just got really diluted.
[1] https://www.bls.gov/opub/mlr/2000/12/art1full.pdf [2] https://en.wikipedia.org/wiki/Software_engineering_demograph...