Year	1=low to 6=high
2005	3.1125
2006	3.073170731707317
2007	3.097560975609756
2008	3.097560975609756
2009	3.1097560975609757
2010	3.097560975609756
2011	3.0714285714285716
2012	3.130952380952381
2013	3.127906976744186
2014	3.158536585365854
2015	3.158536585365854
2016	3.1315789473684212
2017	3.1710526315789473
2018	3.1842105263157894
2019	3.2051282051282053
2020	3.210526315789474
2021	3.1842105263157894
2022	3.2435897435897436
2023	3.230769230769231