Year	1=low to 6=high
2005	3.205555555555556
2006	3.177083333333334
2007	3.1875000000000004
2008	3.178125
2009	3.1868686868686864
2010	3.146464646464646
2011	3.1414141414141414
2012	3.1176470588235294
2013	3.132352941176471
2014	3.1565658585858585
2015	3.1464649494949493
2016	3.1010102020202024
2017	3.0588235294117645
2018	3.085858585858585
2019	3.009803911764705
2020	3.0098039215686265
2021	3.04040403030303
2022	3.044117617647058
2023	3.068627411764705