Year	Percent
1978	8.6353
1979	14.84549
1980	11.3988
1981	8.35261
1982	11.2727
1983	5.17249
1984	3.84423
1985	7.41126
1986	8.12494
1987	8.87644
1988	12.37061
1989	4.5807
1990	1.65026
1991	2.60617
1992	2.46161
1993	1.81287
1994	3.24533
1995	2.40314
1996	2.97713
1997	1.82738
1998	2.11012
1999	1.50362
2000	1.55208
2001	1.48386
2002	0.7015
2003	-0.9631
2004	1.64142
2005	4.46042
2006	0.40827
2007	3.73883
2008	4.38021
2009	1.78801
2010	1.44023
2011	1.19938
2012	2.4805
2013	-1.42355
2014	2.10128
2015	2.45877
2016	1.55546
2017	1.55925