Year	Percent
1960	-0.36563
1961	-0.07064
1962	-0.53438
1963	-2.17869
1964	0.10482
1965	2.16213
1966	1.69098
1967	0.96458
1968	1.96749
1969	1.29763
1970	0.23044
1971	0.76789
1972	0.80831
1973	-1.85775
1974	-3.76433
1975	0.06614
1976	-1.10406
1977	0.95481
1978	2.09782
1979	1.06549
1980	-2.60628
1981	-1.95505
1982	-1.27005
1983	0.47962
1984	-0.42561
1985	-0.41109
1986	1.25014
1987	0.40853
1988	0.04678
1989	-0.01765
1990	0.19956
1991	0.19588
1992	0.04656
1993	3.05019
1994	3.29927
1995	3.67396
1996	4.54301
1997	3.71881
1998	3.0354
1999	1.77581
2000	0.84105
2001	1.25528
2002	0.74595
2003	0.45283
2004	0.58216
2005	-0.11049
2006	-0.83634
2007	-0.35925
2008	-0.78892
2009	-0.65592
2010	-1.96918
2011	-1.5703
2012	0.98785
2013	2.25858
2014	2.85326
2015	2.92996
2016	3.25203
2017	3.07846