Year	1=low to 6=high
2005	3.388157894736842
2006	3.3846153846153846
2007	3.4133333333333336
2008	3.44
2009	3.4155844155844157
2010	3.461038961038961
2011	3.5448717948717947
2012	3.575
2013	3.5987654320987654
2014	3.6052631578947367
2015	3.598684210526316
2016	3.6027397260273974
2017	3.5675675675675675
2018	3.6164383561643834
2019	3.5933333333333333
2020	3.5753424657534247
2021	3.5694444444444446
2022	3.581081081081081
2023	3.5945945945945947