Year	1=low to 6=high
2005	2.6956521739130435
2006	2.64
2007	2.58
2008	2.56
2009	2.5961538461538463
2010	2.5961538461538463
2011	2.6607142857142856
2012	2.6
2013	2.596774193548387
2014	2.661290322580645
2015	2.6129032258064515
2016	2.6129032258064515
2017	2.53125
2018	2.596774193548387
2019	2.578125
2020	2.546875
2021	2.5
2022	2.484375
2023	2.390625