Year	Percent
1992	0.25223
1993	0.27834
1994	0.17465
1995	0.52208
1996	0.65838
1997	1.20136
1998	1.01909
1999	1.6893
2000	1.03117
2001	0.92866
2002	1.00659
2003	1.84238
2004	2.60619
2005	2.0298
2006	3.79772
2007	4.29895
2008	4.5027
2009	2.99213
2010	2.83083
2011	2.68483
2012	2.28876
2013	3.01328
2014	1.06758
2015	0.5008
2016	2.53275
2017	1.81829