Year	1=low to 6=high
2005	3.2727272727272734
2006	3.2055555555555557
2007	3.2121212121212124
2008	3.236363636363636
2009	3.303030303030303
2010	3.303030303030303
2011	3.2564102564102564
2012	3.2261904761904754
2013	3.2111111111111104
2014	3.222221555555556
2015	3.188888222222222
2016	3.190475
2017	3.1547619047619038
2018	3.154761904761903
2019	3.1071427857142853
2020	3.0952380952380945
2021	3.0714286428571427
2022	3.059523857142857
2023	3.059523785714286