nba refs and game tempo

Mark Cuban periodically publishes the intel the Mavericks have collected on various stats revolving around types of foul calls, showing how different ref teems cater to different styles of play, how rule enforcement is effecting the tempo of play, and a variety of other interesting implications.
"Total fouls called are down vs last year, with an average of 46.47 in total fouls being called per game (compared to 48.17 this time last year)...."
[read the Mark Cuban article]