Year	1=low to 6=high
2005	3.4109090909090902
2006	3.396875000000001
2007	3.417767295597483
2008	3.415094339622643
2009	3.4260802469135805
2010	3.4239197530864196
2011	3.402272727272728
2012	3.393601190476191
2013	3.376169590643275
2014	3.341667307692308
2015	3.3262824358974368
2016	3.30561238095238
2017	3.301190476190476
2018	3.2906462585034015
2019	3.30483332
2020	3.2920138888888886
2021	3.2852429583333334
2022	3.2739795510204077
2023	3.2802721020408168