Year	Percent
1961	2.15413
1962	2.34559
1963	-0.13948
1964	3.45611
1965	-0.0129
1966	2.23963
1967	1.1646
1968	3.40498
1969	3.61696
1970	4.19175
1971	3.37052
1972	5.18557
1973	4.34854
1974	3.41208
1975	-0.01916
1976	2.47264
1977	1.80928
1978	6.01999
1979	3.00672
1980	1.75492
1981	-0.03638
1982	-1.31611
1983	-0.6738
1984	1.09733
1985	0.88898
1986	3.63901
1987	3.23779
1988	2.00482
1989	1.4216
1990	4.03974
1991	0.38733
1992	3.1366
1993	0.56557
1994	4.02979
1995	3.46478
1996	0.42758
1997	1.83417
1998	-0.93912
1999	-5.61191
2000	2.90895
2001	0.22686
2002	1.06506
2003	2.48923
2004	3.92277
2005	3.34838
2006	5.35858
2007	5.60251
2008	2.33156
2009	0.49968
2010	2.83532
2011	5.46738
2012	2.99016
2013	3.85174
2014	3.41299
2015	2.11872
2016	1.15227
2017	0.91313