Year	1=low to 6=high
2005	3.0675000000000003
2006	3.048780487804879
2007	3.0512195121951233
2008	3.046341463414635
2009	3.0707317073170737
2010	3.068292682926829
2011	3.080952380952381
2012	3.088095238095238
2013	3.0767441860465117
2014	3.0975609756097566
2015	3.1146341463414635
2016	3.1026315789473684
2017	3.1
2018	3.094736842105262
2019	3.0820512820512813
2020	3.060526315789474
2021	3.052631578947368
2022	3.043589743589744
2023	3.0487179487179494