Year	1=low to 6=high
2005	3.310810810810811
2006	3.3513513513513513
2007	3.3783783783783785
2008	3.391891891891892
2009	3.3947368421052633
2010	3.3421052631578947
2011	3.3815789473684212
2012	3.3205128205128207
2013	3.2564102564102564
2014	3.1578947368421053
2015	3.1052631578947367
2016	3.013157894736842
2017	3
2018	3.013157894736842
2019	3.0256410256410255
2020	3.0256410256410255
2021	3.0384615384615383
2022	3.0384615384615383
2023	3.076923076923077