Year	Percent
1976	2.26
1978	1.33
1979	1.64
1980	1.55
1982	4.14
1984	9.21
1987	10.16
1988	5.56
1989	2.68
1990	4.24
1994	2.65571
1996	2.31908
1997	1.75061
1998	6.45338
1999	7.09935
2000	5.98983
2001	7.22
2003	5.13
2004	4.31
2005	4.57
2006	5.26
2007	4.32
2008	4.67
2009	6.25
2010	3.0888
2011	3.82
2012	3.14
2013	2.9801
2014	3.9
2015	3.8998
2016	4.6998