Year	1=low to 6=high
2005	3.3250000000000006
2006	3.2411764705882358
2007	3.288235294117647
2008	3.3294117647058825
2009	3.3764705882352946
2010	3.4
2011	3.326315789473684
2012	3.3099999999999996
2013	3.3050000000000006
2014	3.285
2015	3.275000000000001
2016	3.2800000000000002
2017	3.275
2018	3.3049999999999997
2019	3.3150000000000004
2020	3.2952380952380955
2021	3.2904761904761903
2022	3.2666666666666666
2023	3.2714285714285714