Year	Percent
1992	85.14991
1993	4.3083
1994	11.7896
1995	12.67806
1996	20.67012
1997	21.18683
1998	6.06745
1999	6.94401
2000	10.61997
2001	13.91204
2002	19.0048
2003	26.85966
2004	30.27135
2005	55.2443
2006	41.20461
2007	40.22848
2008	31.74827
2009	25.22354
2010	27.81344
2011	23.21907
2012	18.38967
2013	13.69086
2014	5.84309
2015	10.96237
2016	13.16903