Year	1=low to 6=high
2005	3.025
2006	3
2007	2.9761904761904763
2008	3.0238095238095237
2009	3
2010	2.977272727272727
2011	2.909090909090909
2012	2.847826086956522
2013	2.8260869565217392
2014	2.8043478260869565
2015	2.8043478260869565
2016	2.847826086956522
2017	2.7916666666666665
2018	2.8043478260869565
2019	2.8125
2020	2.8125
2021	2.8260869565217392
2022	2.8125
2023	2.8333333333333335