Year	1=low to 6=high
2005	3.1818181818181817
2006	3
2007	3.0454545454545454
2008	3.0454545454545454
2009	3.0454545454545454
2010	3.0454545454545454
2011	2.9615384615384617
2012	2.892857142857143
2013	2.9
2014	2.9
2015	2.8666666666666667
2016	2.8214285714285716
2017	2.75
2018	2.75
2019	2.7142857142857144
2020	2.6785714285714284
2021	2.75
2022	2.75
2023	2.7857142857142856