 During that period, A grades have ranged from 37.1 to 37.9% in the social sciences and from 35.1 to 35.9% in the natural sciences.In the humanities and engineering, where deflation has been slower, 2008–09 brought significant movement.A's accounted for 42.5% of grades in the humanities last year and 40.6% of grades in engineering, both down two percentage points compared to 2007–08.