Here is my full season attendance report for the 2014 Major League Baseball Season. Overall, attendance was flat year over year down only .2%.
The big gainers in attendance were the Seattle, Oakland, Milwaukee and Kansas City all of which had double digit growth. As the chart shows, Philadelphia and Texas were the lagers in the bunch.
Here is an interactive visual that you can select each Major League Baseball Team.
For good measure I put in the Jeter Effect Chart: