Year	1=low to 6=high
2005	2.9894736842105263
2006	2.978947368421052
2007	2.9789473684210526
2008	2.952631578947369
2009	2.975
2010	2.9950000000000006
2011	3.04
2012	2.9900000000000007
2013	3
2014	2.99
2015	3.0100000000000007
2016	3.0149999999999997
2017	3.0149999999999997
2018	3.0149999999999997
2019	3.05
2020	3.0500000000000003
2021	3.0650000000000004
2022	3.0550000000000006
2023	3.0750000000000006