Year	1=low to 6=high
2005	2.776315789473684
2006	2.725
2007	2.7375
2008	2.7375
2009	2.731707317073171
2010	2.731707317073171
2011	2.7439024390243905
2012	2.697674418604651
2013	2.6818181818181817
2014	2.6744186046511627
2015	2.686046511627907
2016	2.7093023255813953
2017	2.6704545454545454
2018	2.686046511627907
2019	2.6704545454545454
2020	2.6704545454545454
2021	2.6511627906976742
2022	2.5568181818181817
2023	2.590909090909091