Year	Percent
1991	87.542
1992	87.762
1993	87.686
1994	87.875
1995	87.835
1996	87.955
1997	87.093
1998	85.08
1999	83.584
2000	80.479
2001	83.571
2002	85.693
2003	86.733
2004	87.965
2005	89.629
2006	89.993
2007	90.879
2008	91.699
2009	92.898
2010	93.693
2011	93.433
2012	93.464
2013	93.337
2014	93.377
2015	93.022
2016	92.857
2017	92.922
2018	92.914
2019	92.933
2020	92.983
2021	93.045
2022	93.124