Year	Percent
1990	0
1994	0.06471
1995	0.05394
1996	1.79672
1997	7.9545
1998	14.65445
1999	21.60261
2000	31.74781
2001	35.46414
2002	44.15479
2003	54.53426
2004	56.09901
2005	57.7034
2006	59.36169
2007	61.07
2008	62.82
2009	62.83
2010	63
2011	64
2012	64.89601
2013	65.8
2014	66.7
2015	67.60044
2016	68.50087