If you cannot guess what the numbers should be then how would you know the problem is fixed? Or even if there is any problem at all?
But actually, the question is quite easy to answer for me. I am more interested in sexism per se than in the gender distribution. When women in the industry infrequently report that they are experiencing sexism, then I’ll consider that we’re well on the way to solving the problem. The current gender imbalance is a symptom of the problem, not the problem itself.
This is the fox guarding the henhouse. There is no incentive for women to ever stop crying "sexism!" if this is the criterion in use.