Year	Percent
1960	-13.66102
1961	-14.5617
1962	-10.40661
1963	-14.58081
1964	-10.86663
1965	-11.07236
1966	-7.22547
1967	-7.35216
1968	-5.48335
1969	-9.45124
1970	-19.01634
1971	-20.38088
1972	-15.58402
1973	-9.06177
1974	-15.03545
1975	-9.32765
1976	-6.93912
1977	-1.466
1978	-3.72584
1979	-5.65717
1980	-6.926
1981	-3.41378
1982	-1.8328
1983	0.5844
1984	-0.19543
1985	0.30007
1986	2.63791
1987	2.97127
1988	9.57399
1989	11.03384
1990	10.05073
1991	13.20199
1992	12.13355
1993	9.8782
1994	16.15111
1995	16.69906
1996	16.21152
1997	14.41964
1998	21.30503
1999	16.82852
2000	12.2916
2001	16.20962
2002	17.64983
2003	27.51045
2004	26.36057
2005	29.80596
2006	29.82102
2007	30.78155
2008	20.78517
2009	23.40412
2010	26.05038
2011	26.7909
2012	23.42837
2013	22.47175
2014	23.29305
2015	25.73552
2016	26.12782
2017	24.26229