Professionals who become more sensitive to possible abuse, or more adept at noticing it, would make more reports to Westat--even if the actual incidence had not risen.
Abuse, or the possibility of it in specific situations, is being reported more often.
Drag yourself away to see his other work here, the Madonna di Ca' Pesaro (left nave), in which St. Peter presents the Mary to the Pesaro, a wealthy local family.