Year	1=low to 6=high
2005	2.9086956521739125
2006	2.8320000000000003
2007	2.8520000000000003
2008	2.82
2009	2.853846153846154
2010	2.907692307692308
2011	2.935714285714286
2012	2.923333333333334
2013	2.8967741935483864
2014	2.919354838709677
2015	2.92258064516129
2016	2.8935483870967733
2017	2.843749999999999
2018	2.890322580645161
2019	2.887499999999999
2020	2.912499999999999
2021	2.8967741935483873
2022	2.8781250000000007
2023	2.8625