Year	Percent
1960	-7.24971
1961	-10.32258
1962	-4.25532
1963	-6.27273
1964	-3.9644
1965	-9.61801
1966	-5.00659
1967	-2.5266
1968	-0.47059
1969	-0.5997
1970	-1.37229
1971	-4.48
1972	5.50622
1973	5.0557
1974	-3.47639
1975	0.9275
1976	-0.33711
1977	-1.04811
1978	-1.32946
1979	0.07087
1980	-0.68842
1981	-0.56729
1982	0.35627
1983	-0.43306
1984	-2.72656
1985	-2.93487
1986	-3.55949
1987	-6.52292
1988	-5.87873
1989	-7.60062
1990	-8.9724
1991	-8.56126
1992	-11.54168
1993	-16.16128
1994	-11.50388
1995	-8.4302
1996	-7.98058
1997	-20.58126
1998	-12.85684
1999	-17.54843
2000	-18.44391
2001	-19.57982
2002	-12.25674
2003	-15.92906
2004	-21.06368
2005	-25.27308
2006	-15.53721
2007	-16.30414
2008	-19.45531
2009	-13.01101
2010	-16.42438
2011	-12.42224
2012	-12.4496
2013	-13.27418
2014	-9.40429
2015	-11.69853
2016	-7.18254
2017	-10.80183