Year	1=low to 6=high
2005	3.4545454545454546
2006	3.455357142857143
2007	3.490566037735849
2008	3.509433962264151
2009	3.4814814814814814
2010	3.5277777777777777
2011	3.609090909090909
2012	3.6517857142857144
2013	3.6842105263157894
2014	3.6923076923076925
2015	3.6826923076923075
2016	3.7142857142857144
2017	3.693877551020408
2018	3.7142857142857144
2019	3.73
2020	3.6979166666666665
2021	3.6875
2022	3.7142857142857144
2023	3.7244897959183674