Year	Percent
1960	-0.50801
1961	0.06739
1962	0.71968
1963	1.215
1964	1.6347
1965	1.93125
1966	2.08564
1967	1.7912
1968	1.87344
1969	1.79958
1970	1.62245
1971	1.16626
1972	-0.01278
1973	-0.15026
1974	-0.17612
1975	-0.10582
1976	0.42581
1977	1.65707
1978	1.54965
1979	1.18108
1980	0.62182
1981	-0.02431
1982	-0.55777
1983	-0.73932
1984	-0.3949
1985	0.32714
1986	1.17319
1987	1.84953
1988	2.16175
1989	2.00137
1990	1.52531
1991	0.96961
1992	0.56338
1993	0.28051
1994	0.24929
1995	0.37829
1996	0.53325
1997	0.63399
1998	0.74903
1999	0.79712
2000	0.84934
2001	0.89492
2002	0.95489
2003	1.00274
2004	1.03884
2005	1.06107
2006	1.07246
2007	1.08586
2008	1.06929
2009	1.03615
2010	0.9727
2011	0.88717
2012	0.86521
2013	0.83673
2014	0.82978
2015	0.85518
2016	0.86846
2017	0.87456