Year	1=low to 6=high
2005	2.75
2006	2.7375
2007	2.7375
2008	2.6875
2009	2.658536585365854
2010	2.6463414634146343
2011	2.6951219512195124
2012	2.63953488372093
2013	2.625
2014	2.686046511627907
2015	2.63953488372093
2016	2.63953488372093
2017	2.590909090909091
2018	2.604651162790698
2019	2.6136363636363638
2020	2.602272727272727
2021	2.5697674418604652
2022	2.5568181818181817
2023	2.4886363636363638