Well, statistics say there are male vs female pay differences (for the same job and qualifications) of 75 cents to the dollar (i.e. for every dollar a man makes, a woman makes 75 cents in the same job) even in the US!

Many people suggest this is not because women are being discriminated against but simply because women tend to avoid negotiating salary after a job is offered, or they negotiate less aggressively because we (in general) tend to prefer to avoid conflict/competition/appearing aggressive.

That being said, I was the highest paid engineer in my group of all male engineers in my last two jobs (we were all at the same level). One was in the US and the other was in Switzerland.

So, my suggestion to you: Don't worry about the statistics, just negotiate and get paid what you deserve!

Good luck!