Year	Percent
1988	0.48
1990	0.4
1995	7.85
1997	12.07
1998	9.2
2000	8.09
2002	10.38
2004	8.82
2006	0.2267
2007	0.1526
2008	0.2439
2009	0.2485
2010	0.4932
2011	0.4038
2013	2.8002
2014	1.3817
2015	5.1612