Year	Percent
1990	90
1991	90.04
1992	90.15
1993	90.14
1994	90.15
1995	90.19
1996	90.13
1997	90.06
1998	91.79
1999	93.21
2000	94.38
2001	95.34
2002	96.12
2003	96.76
2004	96.42
2005	96.04
2006	95.61
2007	95.14
2008	94.63
2009	94.05
2010	93.43
2011	92.73
2012	91.98
2013	91.15
2014	90.24
2015	89.24
2016	89.25
2017	89.27
2018	89.29
2019	89.32