Year	1=low to 6=high
2005	3.3583333333333334
2006	3.3455284552845534
2007	3.3821138211382125
2008	3.360975609756098
2009	3.369918699186993
2010	3.357723577235772
2011	3.369047619047618
2012	3.3452380952380953
2013	3.3449612403100777
2014	3.3577234146341453
2015	3.3211381300813
2016	3.2894734210526324
2017	3.2850877192982444
2018	3.267543859649122
2019	3.28205123076923
2020	3.263157894736841
2021	3.2456140263157907
2022	3.2564102051282053
2023	3.2735041794871793