Year	Percent
1978	10.52141
1979	-19.1876
1980	13.67052
1981	11.99366
1982	4.41841
1983	3.27284
1984	6.18499
1985	2.06851
1986	7.98392
1987	8.49181
1988	9.5093
1989	0.45696
1990	5.72385
1991	0.72723
1992	1.86331
1993	1.33825
1994	1.19968
1995	1.98186
1996	2.96351
1997	2.05312
1998	5.66958
1999	1.2407
2000	0.70233
2001	0.48176
2002	-1.96985
2003	7.27394
2004	2.83057
2005	-0.43907
2006	2.66803
2007	6.10672
2008	6.93385
2009	-1.38482
2010	0.3752
2011	-0.61775
2012	-1.52115
2013	-1.09636
2014	3.8853
2015	-3.05525
2016	2.10672
2017	-4.7085