Year	1=low to 6=high
2005	2.9
2006	2.8823529411764706
2007	2.911764705882353
2008	2.911764705882353
2009	2.9150943396226414
2010	2.9245283018867925
2011	2.9
2012	2.8508771929824563
2013	2.836206896551724
2014	2.8793103448275863
2015	2.8275862068965516
2016	2.8333333333333335
2017	2.793103448275862
2018	2.824561403508772
2019	2.7966101694915255
2020	2.7758620689655173
2021	2.763157894736842
2022	2.7711864406779663
2023	2.7457627118644066