In Eastern Europe during the Cold War the trend was also the opposite -- with women in the majority. Women occupied the majority of those "dev" roles as it was laregely seen as womens work.
I think east Europe is also leading the numbers for rate of women in tech, especially as coders and they are ranked among the best in the World.
This was the case in the US too, until about the 80s; not a majority of women working in programming but a much more sizeable portion of the workforce was.
This was a time (there was a similar period in the U.S, but it was earlier) when the direct operation of computers was essentially secretarial work, a level more sophisticated than operating a typewriter; it was not some magical era where women were the majority of people designing and implementing computer programs at the highest levels.
mm and a lot of the first computers where in fact women