Year	Percent
1961	4.13913
1962	0.62114
1963	1.98547
1964	1.49243
1965	3.39188
1966	-0.68559
1967	6.28019
1968	1.80067
1969	2.025
1970	2.92793
1971	2.9884
1972	4.11082
1973	4.78683
1974	5.81736
1975	4.27053
1976	4.87239
1977	8.69117
1978	9.14869
1979	8.91048
1980	8.6864
1981	6.13954
1982	-4.18762
1983	-5.81427
1984	-0.12169
1985	1.56054
1986	2.02138
1987	4.60099
1988	3.02787
1989	4.07989
1990	1.40931
1991	0.86842
1992	-0.81174
1993	2.41418
1994	2.84251
1995	4.36307
1996	-0.7169
1997	1.94745
1998	-2.0745
1999	-3.40875
2000	-4.2625
2001	-2.74019
2002	-1.87242
2003	2.47282
2004	2.30985
2005	0.51651
2006	3.25176
2007	3.9486
2008	4.9352
2009	-5.23072
2010	11.59891
2011	2.95136
2012	-2.56166
2013	12.51031
2014	3.33441
2015	1.62022
2016	2.68648
2017	-0.50014