Year	Percent
1990	76.28
1991	76.83
1992	77.57
1993	78.18
1994	78.55
1995	79.2
1996	79.57
1997	79.98
1998	80.38
1999	80.69
2000	80.93
2001	81.22
2002	81.63
2003	82.06
2004	82.37
2005	82.62
2006	83.01
2007	83.25
2008	83.44
2009	83.55
2010	83.65
2011	83.72
2012	83.89
2013	84.1
2014	84.29
2015	84.47
2016	84.64
2017	84.81
2018	85
2019	85.12