Year	Percent
1984	7.82686
1985	32.36854
1986	51.77188
1987	19.66538
1988	23.18914
1989	25.12818
1990	22.17345
1991	21.66119
1992	21.96159
1993	32.0549
1994	30.36368
1995	33.51467
1996	24.97094
1997	18.31225
1998	16.05874
1999	15.13521
2000	9.44946
2001	5.7704
2002	4.09961
2003	4.3387
2004	3.3448
2005	3.24202
2006	1.60733
2007	1.20309
2008	1.10888
2009	1.39148
2010	3.257
2011	1.96519
2012	1.80827
2013	3.26898
2014	4.48223
2015	9.56432
2016	12.64995