Year	Percent
1961	1.90061
1962	2.01037
1963	5.14752
1964	1.81222
1965	-0.65607
1966	2.30312
1967	-4.41101
1968	-0.26388
1969	6.91315
1970	1.78343
1971	3.37748
1972	7.29665
1973	2.67786
1974	11.01471
1975	8.17616
1976	6.72551
1977	18.66198
1978	14.53233
1979	7.75353
1980	8.69437
1981	13.58462
1982	9.04652
1983	5.40932
1984	6.50109
1985	0.75707
1986	-6.34568
1987	1.23732
1988	3.40856
1989	4.83162
1990	1.81002
1991	-3.96778
1992	0.22706
1993	-1.44184
1994	14.63896
1995	6.76957
1996	0.34871
1997	1.5562
1998	7.94032
1999	4.43648
2000	-0.81977
2001	3.17963
2002	3.83795
2003	1.48478
2004	0.09063
2005	3.7394
2006	-0.66282
2007	0.99499
2008	7.63919
2009	2.40547
2010	6.8061
2011	6.70595
2012	5.82397
2013	-2.12918
2014	-0.62038
2015	-3.07343
2016	4.02413
2017	3.44276