Year	Percent
1960	-0.69998
1961	-0.79212
1962	-0.01146
1963	-0.95751
1964	-0.33177
1965	-0.02353
1966	-0.70353
1967	0.41917
1968	0.46125
1969	1.10927
1970	1.89939
1971	1.6733
1972	2.77556
1973	1.61615
1974	0.1881
1975	0.02459
1976	-0.00689
1977	-0.9524
1978	-1.06741
1979	-2.02777
1980	-3.11709
1981	-2.41789
1982	-2.06876
1983	0.02252
1984	0.19524
1985	0.64311
1986	1.87717
1987	1.46503
1988	2.01758
1989	1.79619
1990	1.37304
1991	1.49072
1992	2.17596
1993	2.84395
1994	3.24279
1995	3.46397
1996	2.82548
1997	3.42685
1998	3.31004
1999	3.80021
2000	2.6361
2001	3.34627
2002	5.50466
2003	5.20188
2004	4.70211
2005	3.66623
2006	3.72838
2007	3.81805
2008	0.48392
2009	2.26279
2010	1.79674
2011	0.51743
2012	0.6167
2013	1.24196
2014	0.63411
2015	1.3594
2016	1.33085
2017	0.70388