Year	Percent
1992	0.27048
1993	0.30465
1994	0.30257
1995	0.55378
1996	1.16926
1997	1.24226
1998	1.77398
1999	1.57058
2000	1.9033
2001	2.0837
2002	1.63471
2003	2.84045
2004	2.64322
2005	9.0641
2006	5.20078
2007	7.14201
2008	5.9447
2009	4.06815
2010	4.74292
2011	4.41715
2012	4.65066
2013	2.45977
2014	0.63444
2015	3.35051
2016	3.68927
2017	2.52064