Year	1=low to 6=high
2005	2.960526315789474
2006	2.9125
2007	2.9375
2008	2.9375
2009	2.9390243902439024
2010	3
2011	3.0365853658536586
2012	3.0232558139534884
2013	2.977272727272727
2014	3.046511627906977
2015	3.0813953488372094
2016	3.0348837209302326
2017	3.0113636363636362
2018	3.0232558139534884
2019	3.034090909090909
2020	3.0568181818181817
2021	3.0348837209302326
2022	3.0454545454545454
2023	3.034090909090909