Over the last few decades average grade point average in U.S. colleges and universities have risen by 0.1 points per decade. The article "Grades on the Rise" in Inside Higher Education reports that in the 1950s the mean G.P.A. was 2.52. By 2006-07, it has risen to 3.11. These findings are based on data collected by Stuart Rojstaczer, a retired Duke University professor who created GradeInflation.com to document grade inflation. The graph above was taken from this website and shows GPA trends broken done by public versus private schools