Year	Percent
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	14.28571
1992	2.63158
1993	10.20408
1994	15.17475
2000	30.49322
2001	30.49322
2002	11.82069
2003	12.84299
2004	9.16679
2005	8.77925
2006	15.3614
2007	13.50498
2008	16.21889
2009	15.22906
2010	14.42293
2011	12.90574
2012	15.11745
2013	14.69819
2014	15.34608
2015	9.55233
2016	8.39858
2017	7.81886