It was "recentered" in 1995. The right side of the distribution was essentially truncated. A 1600 on the pre-1995 SAT was quite an accomplishment (I don't have data at my fingertips, but in most years, fewer than 10 students achieved a perfect score of 1600 and only a few dozen scored 1550+). By contrast, several hundred students a year scored 1600 on the recentered test.

The scoring system has been changed several times since 1995 and I have no idea how the current system compares to the pre-1995 system or the recentered test given for some years afterward.

Many, including myself, suspect that one of the motivations for the recentering was to give colleges cover for their admissions decisions. It is pretty hard to turn down students who get 1600s when only 7 or 8 students a year do so. It is easier to "shape" a class without provoking criticism when a large percentage of students score 1500+.