Year	Percent
1989	8.40329
1990	8.14214
1991	10.68113
1992	6.15
1993	5.12162
1994	8.14919
1995	12.13961
1996	18.42862
1997	19.2277
1998	41.41583
1999	27.04819
2000	20.92943
2001	33.12332
2002	16.95554
2003	15.31266
2004	13.62948
2005	10.75341
2006	13.22275
2007	9.9055
2008	2.5224
2009	8.54841
2010	4.4786
2011	4.17698
2012	5.85652
2013	7.01181
2014	10.45375
2015	15.62699
2016	26.47517