Year	1=low to 6=high
2005	3.4576719576719577
2006	3.4364102564102565
2007	3.456410256410256
2008	3.455384615384615
2009	3.4651741293532337
2010	3.45771144278607
2011	3.439613526570048
2012	3.3826291079812205
2013	3.3495370370370368
2014	3.3379627314814813
2015	3.303240648148148
2016	3.246479107981221
2017	3.2106481481481484
2018	3.2089201877934266
2019	3.2260274429223728
2020	3.2237442922374417
2021	3.2152778055555555
2022	3.157657702702702
2023	3.1509009324324313