2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | |
East | 9.27 | 6.71 | 6.84 | 6.88 | 7.09 | 7.67 | 7.86 | 8.2 | 8.2 |
West | 5.88 | 4.18 | 4.14 | 3.84 | 3.91 | 4.15 | 4.29 | 4.69 | 4.69 |
Mid | 7.06 | 5.43 | 5.47 | 5.51 | 5.71 | 5.96 | 6.16 | 6.65 | 6.65 |
East/West | 1.58 | 1.61 | 1.65 | 1.79 | 1.81 | 1.85 | 1.83 | 1.75 | 1.75 |
East/Mid | 1.31 | 1.24 | 1.25 | 1.25 | 1.24 | 1.29 | 1.28 | 1.23 | 1.23 |
Mid/West | 1.2 | 1.3 | 1.32 | 1.43 | 1.46 | 1.43 | 1.43 | 1.42 | 1.42 |