Year	1=low to 6=high
2005	3.3
2006	3.3095238095238093
2007	3.357142857142857
2008	3.4047619047619047
2009	3.3863636363636362
2010	3.409090909090909
2011	3.3636363636363638
2012	3.217391304347826
2013	3.152173913043478
2014	3.0217391304347827
2015	2.9347826086956523
2016	2.891304347826087
2017	2.8125
2018	2.869565217391304
2019	2.8541666666666665
2020	2.8125
2021	2.8043478260869565
2022	2.75
2023	2.75