Year	Percent
1990	8.06818
1991	1.42988
1992	0.94216
1993	9.02748
1994	1.8638
1995	1.21321
1996	2.224
1997	0.85876
1998	18.28431
1999	3.30612
2000	0.57227
2001	0.90597
2002	1.03602
2003	0.64706
2004	0.56554
2005	0.78242
2006	1.16831
2007	1.06469
2008	0.66281
2009	1.65034
2010	1.03752
2011	9.68529
2012	0.37311
2013	0.29894
2014	0.57146
2015	0.18627
2016	0.64781