Year	1=low to 6=high
2005	3.7533333333333334
2006	3.7662337662337664
2007	3.7364864864864864
2008	3.6554054054054053
2009	3.6842105263157894
2010	3.6776315789473686
2011	3.642857142857143
2012	3.632911392405063
2013	3.5875
2014	3.54
2015	3.48
2016	3.423611111111111
2017	3.404109589041096
2018	3.423611111111111
2019	3.47972972972973
2020	3.4444444444444446
2021	3.443661971830986
2022	3.3493150684931505
2023	3.363013698630137