Year	Percent
1961	2.88785
1962	0.12468
1963	2.36993
1964	6.66458
1965	-1.85784
1966	0.38068
1967	-0.11234
1968	3.91864
1969	9.43521
1970	3.99216
1971	1.6928
1972	5.31293
1973	7.12277
1974	2.8623
1975	-7.58648
1976	2.0281
1977	1.39354
1978	3.88839
1979	2.10614
1980	0.48255
1981	-0.84367
1982	1.04829
1983	2.96175
1984	6.07785
1985	2.59325
1986	9.49157
1987	3.27947
1988	7.67911
1989	8.73531
1990	4.00981
1991	7.19841
1992	0.47608
1993	2.81122
1994	2.41663
1995	0.0173
1996	0.01774
1997	4.39291
1998	4.73376
1999	7.02569
2000	6.7947
2001	1.31861
2002	2.73747
2003	0.40176
2004	2.14992
2005	1.60586
2006	3.51414
2007	6.694
2008	-3.02853
2009	-6.11337
2010	2.96812
2011	0.28528
2012	-2.71709
2013	1.28621
2014	3.30804
2015	0.46261
2016	0.88466
2017	-0.6774