Year	1=low to 6=high
2005	3.3024999999999998
2006	3.29390243902439
2007	3.3166666666666664
2008	3.309756097560976
2009	3.3260162601626027
2010	3.3254065040650413
2011	3.327380952380954
2012	3.332142857142859
2013	3.3180232558139524
2014	3.3302851219512184
2015	3.3168705691056926
2016	3.2896933333333345
2017	3.2837719298245616
2018	3.2695175438596484
2019	3.273931641025641
2020	3.2701754385964916
2021	3.255263078947369
2022	3.2435897179487188
2023	3.2472222564102564