Year	1=low to 6=high
2005	3.0636363636363635
2006	3.0267857142857144
2007	3.0377358490566038
2008	3.0754716981132075
2009	3.064814814814815
2010	3.0833333333333335
2011	3.036363636363636
2012	3.0267857142857144
2013	3.008771929824561
2014	3.0576923076923075
2015	3.019230769230769
2016	3
2017	2.989795918367347
2018	2.989795918367347
2019	2.98
2020	2.9375
2021	2.9270833333333335
2022	2.9591836734693877
2023	2.938775510204082