I mean, it looks like 21% of all engineering degrees went to women, which is the easiest way to guesstimate the job data (and is generally how they guess the percentage of women in the workplace, along with questionaires). I get that you're being pedantic, before you start to explain yourself, but still.
EDIT:
Maybe tax forms, but I'm not sure the legality of that... but I think it's still the census.
EDIT: Maybe tax forms, but I'm not sure the legality of that... but I think it's still the census.