From my small amount of experience, I saw even less percentage of females in computer science. By the time I got to the upper level courses in Comp Sci at UMD, I usually had 1 female classmate. Sometimes 2, sometimes none. In my 3 years of working since graduation, I can count the number of female developers I've worked with on one hand. If I restrict the sample to American-born women, that number goes to 0. I'd be interested to see some breakdowns of technology gender ratios in various countries. If some of them have a better ratio, maybe we can start to understand why.