 The 2006–09 results also mark continued deflation from those reported a year ago, when A's accounted for 40.4% of undergraduate grades in the 2005–08 period.In humanities departments, A's accounted for 44.1% of the grades in undergraduate courses in 2006–09, down from 55.6% in 2001–04.In the social sciences, there were 37.7% A grades in 2006–09, down from 43.3% in 2001–04.