The following data is taken from the Taulbee Survey and goes from 2001-2011 just looking at the ethnicity trends for students receiving a CS bachelor degree (as a percent). The ethnicity breakdown comes from the 2001 survey which have changed slightly over time. The biggest change I noticed was that the later surveys split Asian and Pacific Islander into two groups so I summed up these two groups an calculated the percentage from there. The raw data I graphed is available in a google doc.
Native American/Alaskan Native