Year	Percent
1985	1.39
1987	6.21
1988	6.1
1989	5.12
1990	4.33
1991	4.99
1992	5.55
1993	5.52
1994	5.47
1995	5.21
1996	5.15
1997	5.23
1998	5.82
1999	5.44
2000	6.31
2001	0.7497
2002	6.61
2003	0.6293
2004	0.6552
2005	0.6999
2006	0.84
2007	0.7731
2008	0.6348
2009	0.6483
2010	0.5657
2011	0.5808
2012	0.6404
2013	0.5817
2014	0.6902
2016	0.4993
2017	0.5831