Year	1=low to 6=high
2005	3.609090909090909
2006	3.5892857142857144
2007	3.5849056603773586
2008	3.5849056603773586
2009	3.6018518518518516
2010	3.6018518518518516
2011	3.536363636363636
2012	3.517857142857143
2013	3.508771929824561
2014	3.4711538461538463
2015	3.4711538461538463
2016	3.4183673469387754
2017	3.4081632653061225
2018	3.3979591836734695
2019	3.43
2020	3.4270833333333335
2021	3.4166666666666665
2022	3.4489795918367347
2023	3.4489795918367347