Around 30%-40%. I don't have hard numbers,
but I have a feeling that it has gone down a bit in the last 10 years.
Your feelings are quite accurate as to the range,
but less so regarding the trend.
According to a recent study, 35.6% of high-tech employees in Israel are women,
and this percentage has been relatively stable for the past 10 years.
Women make up 47.5% of all employees with academic credentials (as of 2010) in
so high-tech is actually comparatively under-represented.
On the other hand, only 32.9% of managerial positions (in all sectors)
are occupied by women.