Year	Percent
1990	79.03
1991	79.08
1992	79.1
1993	79.27
1994	79.47
1995	79.41
1996	79.34
1997	79.25
1998	79.14
1999	79.02
2000	78.88
2001	78.71
2002	78.52
2003	79.64
2004	82.69
2005	82.28
2006	79.6
2007	81.7
2008	80.88
2009	80.78
2010	80.65
2011	81.31
2012	84.62
2013	84.4
2014	82.24
2015	83.16
2016	82.69
2017	82.92
2018	84.41
2019	85.03