Year	1=low to 6=high
2005	3.2514999999999996
2006	3.2334967320261443
2007	3.251307189542482
2008	3.2509803921568623
2009	3.253930817610063
2010	3.2555031446540883
2011	3.2480303030303044
2012	3.208040935672516
2013	3.192959770114943
2014	3.195259712643679
2015	3.1751442528735643
2016	3.1514622807017547
2017	3.1214080459770117
2018	3.1352339181286553
2019	3.1141242994350287
2020	3.107327586206898
2021	3.104970754385965
2022	3.0795197966101697
2023	3.0752825084745763