Year	1=low to 6=high
2005	2.9545454545454546
2006	2.955357142857143
2007	2.990566037735849
2008	2.9716981132075473
2009	3
2010	2.9722222222222223
2011	3.0545454545454547
2012	3.0892857142857144
2013	3.1052631578947367
2014	3.0865384615384617
2015	3.0865384615384617
2016	3.061224489795918
2017	3.0510204081632653
2018	3.0306122448979593
2019	3.05
2020	3.0833333333333335
2021	3.1041666666666665
2022	3.0918367346938775
2023	3.1020408163265305