Year	Percent
1961	-0.5492
1962	3.30569
1963	-3.52617
1964	-4.40138
1965	-1.31095
1966	-3.62983
1967	-1.0705
1968	-2.29316
1969	4.81388
1970	-0.24189
1971	-4.41308
1972	-1.21035
1973	-10.55034
1974	2.55058
1975	6.65201
1976	0.90048
1977	0.26974
1978	-2.34415
1979	-22.95285
1980	-7.94931
1981	-1.10773
1982	3.00004
1983	12.95037
1984	-0.525
1985	18.50395
1986	-6.85276
1987	-5.36837
1988	11.83752
1989	1.54355
1990	-7.21506
1991	5.1252
1992	4.61621
1993	-18.36514
1994	6.61541
1995	-2.06905
1996	-1.17914
1997	2.09859
1998	3.28501
1999	-4.17282
2000	-4.45254
2001	7.52779
2002	4.40937
2003	10.4102
2004	28.71852
2005	13.17204
2006	-2.77623
2007	-0.12221
2008	-0.2623
2009	0.87516
2010	9.87804
2011	-3.18666
2012	5.31332
2013	2.25177
2014	3.46637
2015	-0.45981
2016	-9.12983
2017	-5.8681