However , in terms of home - run production , it has actually been closer to the middle - of - the - pack since the left , center and right - center walls were moved in .
Walls were lowered following the 2011 season .
However , in terms of home - run production , it has actually been closer to the middle - of - the - pack since the left , center and right - center walls were moved in and walls were lowered following the 2011 season .