Year	Percent
1961	2.92715
1962	-1.82872
1963	2.81653
1964	-4.28169
1965	1.57193
1966	-1.67012
1967	4.98673
1968	-1.21187
1969	8.88039
1970	18.6316
1971	5.34391
1972	4.71585
1973	-0.82025
1974	3.13339
1975	-5.04914
1976	-2.60773
1977	-9.63391
1978	-5.62852
1979	0.03465
1980	10.54954
1981	8.47121
1982	-1.215
1983	-2.28736
1984	-5.60697
1985	3.03334
1986	-1.51062
1987	-2.30043
1988	4.06947
1989	2.03143
1990	4.04072
1991	2.90507
1992	-11.05812
1993	-1.0138
1994	7.16002
1995	-1.64156
1996	8.46439
1997	0.99934
1998	1.29975
1999	-2.22579
2000	-4.3101
2001	0.25909
2002	-9.87326
2003	-17.87133
2004	-6.86622
2005	-6.89531
2006	-4.81668
2007	-5.13968
2008	-19.05683
2009	9.9745
2010	10.37743
2011	13.03572
2012	12.25024
2013	3.12064
2014	-0.23973
2015	-0.66792
2016	-1.7075
2017	1.07185