(This is an updated post from something I released this morning. There was an issue with the data this morning which changed the overall numbers.)
Major League Baseball is flat year over year and down about 1% over the the previous 3 year average.
Looking at a team by team basis, roughly half the teams are down and half are up over the 3 year average.
Here is the same chart but only looking at 2013 vs. 2014 numbers.
More of the same but showcasing the long term trend of some of the teams.