In Sweden during 2012, over 99% of professional stone layers where males. This is professionals that install bathrooms, construct kitchen walls and stone floor. Similar, two other profession during same year had over 99% gender segregation and that was dentist nurses and midwifes with females being the dominating gender.
Then there were additional 3-4 professions with exactly 99% gender segregation. Mechanics (male), nurse secretary (female), but I don't remember the names of the other. All those professions existed where for every minority gender there where hundred or hundreds employed of the majority.
Is this proof of systemic sexism, and if so, what conclusion can we draw? Remember that in Sweden the number of employed women and men is only off by less than 1%, and only 12.5% of the population work in a profession where the majority gender is lesser than 150% to the minority. Of those 12.5%, men was that year slightly more likely to work in a gender equal profession.