Complaining About Cause Instead of Effect
All of these stories about employment percentages are totally missing the forest for the trees. You can't hire people who don't exist, or hire based on demographics without taking skills into effect. In the tech industry we're generally talking about highly-skilled positions and if less than 20% of the applicants for a job are female (this is approximate based solely on the company I personally work for), you're not going to end up with many female technical hires.
The idea that it's prejudice creating this sort of gender imbalance is missing the point entirely. Look at the enrollment statistics are universities, look at the number of people with technical experience on job sites. In western countries, women rarely pursue technical careers and that's the main problem. Our culture says that tech jobs are for men. Prejudice is definitely a serious issue, but it's not the main issue. That's what we need to work on, because jumping all over the effect and totally ignoring the cause is totally pointless.
Anecdotally, the company I work for is more than 40% female because the overwhelming number of our PMs and support people are female, for similar reasons as to why most of our developers are male. That's who applied and had the skills we were looking for.