Year	Percent
1992	6.77166
1993	3.89759
1994	4.36208
1995	14.06497
1996	38.21011
1997	8.04145
1998	46.95961
1999	55.22567
2000	39.991
2001	13.51956
2002	6.87835
2003	7.89107
2004	9.20774
2005	8.9388
2006	22.29929
2007	4.67917
2008	4.43448
2009	4.93316
2010	8.39757
2011	13.26775
2012	9.2239
2013	9.43426
2014	8.0742
2015	6.45954
2016	4.4575