Year	Percent
1976	3.51
1978	2.23
1979	2.49
1980	2.08
1982	4.09
1984	8.63
1987	9.14
1988	5.01
1989	2.2
1990	4.32
1994	2.57448
1996	2.57633
1997	2.5351
1998	8.23361
1999	8.2611
2000	7.02338
2001	7.86
2003	4.95
2004	4.64
2005	4.91
2006	4.44
2007	4.57
2008	4.83
2009	5.14
2010	2.1494
2011	2.25
2012	2.4
2013	2.0254
2014	2.6222
2015	2.5591
2016	3.0301