Year	Percent
1976	4.1029
1977	3.5077
1978	3.1271
1979	2.46233
1980	2.58778
1981	4.6654
1982	3.33737
1983	2.21119
1984	2.58844
1985	6.25357
1986	2.77904
1987	2.16205
1988	1.50974
1989	0.30223
1990	0.30541
1991	0.3032
1992	0.27027
1993	0.21176
1994	2.74047
1995	3.33865
1996	2.47976
1997	1.75642
1998	0.49354
1999	1.44216
2000	1.70779
2001	1.37204
2002	1.25183
2003	1.15446
2004	0.9055
2005	0.27636
2006	0.26276
2007	1.72481
2008	1.33995
2009	0.62962
2010	0.63422
2011	0.74295
2012	17.71026
2013	-5.12049
2014	-5.72393
2015	-6.32927
2016	-5.50033
2017	-4.33866