Year	Percent
1990	0.08874
1991	0.17663
1994	2.93897
1995	1.55221
1996	0.83794
1997	0.82035
1998	0.35908
1999	0.79365
2000	2.02618
2001	2.87111
2002	0.16005
2003	0.36354
2004	0.95604
2005	3.09658
2006	1.81413
2007	1.37651
2008	1.87773
2009	2.81416
2010	1.29092
2011	3.18331
2012	1.66195
2013	5.9651
2014	2.52431
2015	2.15685