Year	Percent
1985	0.00002
1986	0.00002
1987	22.25
1988	21.9805
1989	19.43233
1990	17.46367
1991	7.1025
1992	5.68283
1993	17.52259
1994	5.70928
1995	4.70739
1996	2.44785
1997	5.97227
1998	2.64201
1999	17.33469
2000	6.3926
2001	4.52435
2002	2.86993
2003	3.76148
2004	3.47118
2005	3.69224
2006	3.7615
2007	3.11405
2008	3.57312
2009	4.70439
2010	4.17758
2011	3.25566
2012	3.23666
2013	4.45524
2014	4.69845
2015	3.13375
2016	2.64154
2017	2.20134