Year	Percent
1961	-7.5192
1962	5.57049
1963	7.371
1964	3.29882
1965	-3.51427
1966	11.0923
1967	-1.93584
1968	4.98083
1969	-2.35081
1970	6.36335
1971	13.53241
1972	3.7772
1973	7.39993
1974	-0.52433
1975	0.81949
1976	13.9484
1977	-8.13669
1978	20.44213
1979	14.80423
1980	-5.11884
1981	-9.32459
1982	-1.69795
1983	-1.59008
1984	3.89424
1985	10.22813
1986	-0.79716
1987	0.0648
1988	5.00432
1989	10.53646
1990	6.47217
1991	1.40077
1992	6.67081
1993	4.00666
1994	-3.40824
1995	-2.27301
1996	3.38942
1997	10.65542
1998	6.30396
1999	-0.10944
2000	0.61219
2001	-2.35661
2002	-1.83481
2003	-4.81618
2004	-2.49001
2005	8.5019
2006	7.15334
2007	9.85915
2008	-4.31088
2009	-1.49268
2010	3.03728
2011	10.76087
2012	0.27234
2013	4.07802
2014	2.8919
2015	2.62339
2016	3.11447
2017	2.93233