Year	Percent
1961	-0.95114
1962	2.85805
1963	0.72751
1964	2.48825
1965	5.97125
1966	2.37178
1967	2.92546
1968	3.50467
1969	-2.27509
1970	0.60786
1971	0.96724
1972	2.68027
1973	4.71328
1974	-4.14181
1975	-0.9141
1976	7.17336
1977	7.03642
1978	6.65699
1979	1.47868
1980	-2.3864
1981	-0.56615
1982	-4.35955
1983	-3.89052
1984	1.24316
1985	1.11451
1986	-2.22282
1987	2.95803
1988	1.59982
1989	1.34015
1990	-2.75516
1991	0.32404
1992	2.64778
1993	3.25948
1994	-4.03738
1995	1.21169
1996	0.79171
1997	2.18931
1998	0.19039
1999	-4.43898
2000	3.04034
2001	0.13284
2002	1.1829
2003	2.01038
2004	3.72059
2005	3.61592
2006	4.19358
2007	3.89364
2008	2.05121
2009	-4.40318
2010	1.7089
2011	1.88592
2012	2.24281
2013	0.98525
2014	1.28651
2015	2.08315
2016	2.02116
2017	3.06396