Year	Percent
1961	-1.82038
1962	1.96415
1963	6.31106
1964	2.7392
1965	2.66464
1966	-6.28851
1967	-17.55373
1968	-3.39693
1969	21.44918
1970	22.18323
1971	11.618
1972	0.9549
1973	2.85425
1974	8.34329
1975	-7.77004
1976	5.94516
1977	2.88582
1978	-8.58979
1979	3.62244
1980	1.26932
1981	-15.45478
1982	-3.59523
1983	-7.42755
1984	-4.46862
1985	5.58207
1986	-11.09884
1987	-13.06454
1988	4.75005
1989	3.72184
1990	9.89491
1991	-3.1158
1992	-2.0668
1993	-0.4332
1994	-1.57481
1995	-2.75861
1996	2.41332
1997	0.27591
1998	0.18887
1999	-2.00238
2000	2.71429
2001	1.82173
2002	1.20083
2003	7.58989
2004	30.35658
2005	0.80466
2006	5.42279
2007	4.05371
2008	3.49216
2009	4.12619
2010	4.99983
2011	2.11909
2012	1.52409
2013	2.61463
2014	3.51962
2015	-0.02224
2016	-4.16011
2017	-1.77158