Year	1=low to 6=high
2005	3.4625
2006	3.4878048780487805
2007	3.573170731707317
2008	3.597560975609756
2009	3.5609756097560976
2010	3.524390243902439
2011	3.5238095238095237
2012	3.5595238095238093
2013	3.5697674418604652
2014	3.5853658536585367
2015	3.548780487804878
2016	3.513157894736842
2017	3.4473684210526314
2018	3.4078947368421053
2019	3.3846153846153846
2020	3.3815789473684212
2021	3.3421052631578947
2022	3.3205128205128207
2023	3.269230769230769