Year	Percent
1988	1.63
1990	1.45
1995	3.91
1997	3.74
1998	4.19
2000	4.53
2002	5.15
2004	5.65
2006	0.2931
2007	0.0426
2008	0.0957
2009	0.3077
2010	0.2164
2013	1.8956
2014	0.4911
2015	2.7516