Year	1=low to 6=high
2005	3.277272727272728
2006	3.2284722222222215
2007	3.2295454545454545
2008	3.2818181818181817
2009	3.3318181818181825
2010	3.3515151515151516
2011	3.2807692307692307
2012	3.2357142857142853
2013	3.2022222222222223
2014	3.203333333333333
2015	3.183889111111112
2016	3.1369042857142864
2017	3.119047619047619
2018	3.1214285714285714
2019	3.1029761428571425
2020	3.0940476190476183
2021	3.060118928571429
2022	3.0511903571428576
2023	3.034523714285715