Year	Percent
1988	1.29
1990	1.31
1995	18.15
1997	20.95
1998	18.47
2000	29.22
2002	20.56
2004	14.88
2006	0.5951
2007	0.4956
2008	1.2623
2009	0.642
2010	1.0816
2011	1.3372
2013	5.3961
2014	3.8744
2015	9.4263