Year	Percent
1961	6.55789
1962	3.57
1963	1.18132
1964	7.51927
1965	5.01652
1966	2.69832
1967	2.00787
1968	-4.54405
1969	2.94577
1970	5.97277
1971	2.50591
1972	18.99603
1973	42.95017
1974	61.53957
1975	6.69528
1976	8.60289
1977	12.5365
1978	14.10381
1979	19.79717
1980	25.04895
1981	29.48603
1982	158.28275
1983	265.19796
1984	1443.39738
1985	12338.66161
1986	230.10516
1987	14.5842
1988	17.52333
1989	13.18643
1990	16.26794
1991	17.68944
1992	13.19921
1993	6.55716
1994	7.9522
1995	11.42729
1996	11.58021
1997	5.70504
1998	7.05113
1999	2.41156
2000	5.19541
2001	1.87009
2002	2.82076
2003	6.32999
2004	7.96771
2005	5.9408
2006	13.66368
2007	7.37336
2008	10.38118
2009	-2.4199
2010	8.77751
2011	14.60235
2012	7.10028
2013	5.99539
2014	2.0495
2015	-4.6206
2016	-1.35487
2017	6.0614