Year	Percent
1987	1.84098
1988	2.11099
1989	2.08491
1990	1.25636
1991	1.22855
1992	1.08347
1993	1.19865
1994	1.19256
1995	1.11576
1996	1.08559
1997	1.17017
1998	0.95129
1999	0.97414
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0