Year	Percent
1990	0.361
1991	0.57039
1992	0.91598
1993	1.18456
1994	2.37869
1995	4.16353
1996	6.76024
1997	15.07236
1998	24.8974
1999	36.18644
2000	51.3
2001	60.2
2002	61.5933
2003	64.2
2004	65.95596
2005	71.66
2006	72.4
2007	73.2
2008	76.7
2009	80.3
2010	80.3
2011	83
2012	83
2013	85.8
2014	87.12
2015	88.47
2016	91.16