Year	Percent
1960	-1.13103
1961	-1.37222
1962	-1.51767
1963	-0.33459
1964	-2.22895
1965	-2.03347
1966	-1.93408
1967	-1.26478
1968	1.07169
1969	0.42444
1970	-1.68
1971	-2.30454
1972	-0.4837
1973	-1.29827
1974	-3.85025
1975	-6.06085
1976	-2.1724
1977	1.31164
1978	3.09241
1979	1.04285
1980	-1.3004
1981	0.97653
1982	0.17277
1983	-0.01046
1984	2.37018
1985	0.66913
1986	1.31017
1987	0.51807
1988	-0.34656
1989	-1.82709
1990	-1.54818
1991	-0.94869
1992	0.84618
1993	4.59486
1994	5.64186
1995	7.45566
1996	6.91848
1997	7.33804
1998	7.91647
1999	8.96843
2000	9.17944
2001	9.1597
2002	8.88131
2003	6.49473
2004	6.18702
2005	3.88352
2006	4.15899
2007	4.81767
2008	3.64409
2009	2.01073
2010	1.26563
2011	-0.85082
2012	-1.44299
2013	-0.88523
2014	-0.93004
2015	-0.47184
2016	-0.74198
2017	0.45902