Year	Percent
1990	87.34
1991	87.45
1992	87.82
1993	88.18
1994	88.66
1995	89.08
1996	89.01
1997	88.64
1998	88.35
1999	88.2
2000	88.6
2001	88.99
2002	89.37
2003	89.73
2004	90.08
2005	90.41
2006	90.73
2007	91.04
2008	91.34
2009	91.64
2010	91.93
2011	92.23
2012	92.52
2013	92.81
2014	93.1
2015	93.38
2016	93.64
2017	94.54
2018	94.73
2019	94.77