What career has seen the number of female workers increase in the last 20 years?

In the last 20 years, the concept of "Some careers are only for man/woman" has ben almost vanished.

Today you can see a lot of women working in things that years back you wouldn't, like especially in things like sciences and engineering.

So I think that the correct answer is all the careers, today women can study what they actually want to study and not what the society tells them to, so in almost every career you will see more female presence.