Year	1=low to 6=high
2005	2.6739130434782608
2006	2.62
2007	2.64
2008	2.6
2009	2.6538461538461537
2010	2.6923076923076925
2011	2.6607142857142856
2012	2.6166666666666667
2013	2.596774193548387
2014	2.7580645161290325
2015	2.5806451612903225
2016	2.564516129032258
2017	2.515625
2018	2.5483870967741935
2019	2.515625
2020	2.5
2021	2.4838709677419355
2022	2.4375
2023	2.390625