Year	1=low to 6=high
2005	3.5657894736842106
2006	3.55
2007	3.6
2008	3.575
2009	3.5853658536585367
2010	3.5853658536585367
2011	3.5609756097560976
2012	3.5
2013	3.465909090909091
2014	3.488372093023256
2015	3.395348837209302
2016	3.3372093023255816
2017	3.2954545454545454
2018	3.313953488372093
2019	3.272727272727273
2020	3.272727272727273
2021	3.2674418604651163
2022	3.1931818181818183
2023	3.1931818181818183