Year	Percent
1960	1.46541
1961	-0.62915
1962	-1.81547
1963	-3.06777
1964	-2.57187
1965	-4.95281
1966	-4.6634
1967	-3.33249
1968	-2.0318
1969	-1.79566
1970	-1.47239
1971	0.2229
1972	-0.40853
1973	-1.36809
1974	-5.22276
1975	-4.23868
1976	-4.84543
1977	-2.56176
1978	0.13053
1979	-0.33125
1980	-2.87295
1981	-2.69368
1982	-2.45029
1983	-1.48142
1984	1.21085
1985	1.00641
1986	1.17187
1987	-0.74485
1988	-1.98273
1989	-4.05464
1990	-4.0425
1991	-3.83866
1992	-3.4821
1993	-1.40536
1994	-0.87842
1995	-0.96661
1996	-0.0916
1997	0.21523
1998	-0.4978
1999	-1.94358
2000	-3.00549
2001	-2.34973
2002	-2.02859
2003	-2.21675
2004	-3.85468
2005	-4.99954
2006	-5.91533
2007	-5.99099
2008	-5.12495
2009	-1.15036
2010	-1.30498
2011	-0.24588
2012	1.46882
2013	3.25546
2014	2.42952
2015	2.26973
2016	3.0172
2017	2.66675