Year	Percent
1960	1.93631
1961	2.17376
1962	2.29818
1963	2.13617
1964	1.61215
1965	0.87284
1966	0.01748
1967	-0.69061
1968	-1.02185
1969	-0.80344
1970	-0.18192
1971	0.59191
1972	1.22173
1973	1.60364
1974	1.62417
1975	1.39768
1976	1.10551
1977	0.90332
1978	0.80187
1979	0.85443
1980	1.00396
1981	1.18694
1982	1.29558
1983	1.27043
1984	1.06711
1985	0.74842
1986	0.38133
1987	0.07123
1988	-0.12027
1989	-0.13872
1990	-0.03281
1991	0.12081
1992	0.23214
1993	0.27144
1994	0.19958
1995	0.05282
1996	-0.11597
1997	-0.24301
1998	-0.3053
1999	-0.41933
2000	-0.02797
2001	0.40236
2002	0.40075
2003	0.39915
2004	0.17722
2005	0.14793
2006	0.1243
2007	0.13811
2008	0.17748
2009	0.21453
2010	0.18324
2011	0.10504
2012	0.08415
2013	0.0976
2014	0.09702
2015	0.05611
2016	0.02314
2017	0.02699