So you don't think in the long run women aren't equal to men? Seriously?
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So what should they do to make sure women get onto boards?
I think you're mistaking population numbers with potential candidates.
For example I did a Computer Science Degree. As is typical there were 4 women and 125 men. Now assuming no difference between men and women the chance that any individual you select will be the top of the class is 1/129 or 0.007% . The chance that the individual will be a man is 97% and the chance it will be a woman is 3%. The workplace reflects those odds.
ps
We all thought it sucked that choosing maths or engineering type subjects meant almost no women on our course. My girlfriend is a pharmacist and if you look at the numbers on her course in Ireland each year (M/F) and look at the senior pharmacists, yep more women on the course, more women than men senior pharmacists.