One plausible theory I've heard is that the early 1980s and the 1990s were a "boom" period for CS, particularly with the dot-com boom in the 1990s. CS saw huge

One plausible theory I've heard is that the early 1980s and the 1990s were a "boom" period for CS, particularly with the dot-com boom in the 1990s. CS saw huge spikes of enrollment during that period, and apparently a larger proportion of women lined up to get a CS degree during the booms.