Year	Percent
1990	0
1996	0
1997	0.43979
1998	0.86273
1999	2.51567
2000	3.52042
2001	5.89384
2002	6.8734
2003	7.25574
2004	6.75885
2005	6.68358
2006	8.29972
2007	16.68
2008	20
2009	26.8
2010	35.8278
2011	48
2012	60
2013	66.45
2014	70.22
2015	73.53
2016	76.85