Year	1=low to 6=high
2005	3.2432432432432434
2006	3.2162162162162162
2007	3.2432432432432434
2008	3.22972972972973
2009	3.210526315789474
2010	3.25
2011	3.236842105263158
2012	3.1923076923076925
2013	3.2051282051282053
2014	3.236842105263158
2015	3.210526315789474
2016	3.1710526315789473
2017	3.128205128205128
2018	3.1842105263157894
2019	3.1666666666666665
2020	3.1923076923076925
2021	3.1923076923076925
2022	3.230769230769231
2023	3.2564102564102564