Year	Percent
2000	93.14004
2001	93.29478
2002	93.44469
2003	93.59265
2004	93.40535
2005	93.06985
2006	92.70616
2007	92.34106
2008	91.97481
2009	91.60719
2010	91.23834
2011	90.86839
2012	90.4989
2013	90.13009
2014	90.27309
2015	90.4168
2016	90.56121
2017	90.70613
2018	90.85157
2019	90.99735
2020	91.02995
2021	91.06404
2022	91.09963