Year	1=low to 6=high
2005	3.189189189189189
2006	3.2162162162162162
2007	3.2162162162162162
2008	3.1621621621621623
2009	3.210526315789474
2010	3.3026315789473686
2011	3.3289473684210527
2012	3.282051282051282
2013	3.282051282051282
2014	3.276315789473684
2015	3.276315789473684
2016	3.25
2017	3.2435897435897436
2018	3.3289473684210527
2019	3.3205128205128207
2020	3.3461538461538463
2021	3.371794871794872
2022	3.4358974358974357
2023	3.41025641025641