Year	Percent
1961	-0.41794
1962	7.64019
1963	7.1904
1964	2.10626
1965	-1.05686
1966	-2.35871
1967	1.78631
1968	4.03253
1969	2.83048
1970	2.10484
1971	1.18497
1972	8.02843
1973	4.50719
1974	17.71018
1975	16.95404
1976	2.86178
1977	10.57916
1978	1.90179
1979	10.1799
1980	11.68969
1981	5.09345
1982	7.76077
1983	3.47348
1984	18.33185
1985	55.29218
1986	9.38727
1987	14.42296
1988	43.53588
1989	23.6088
1990	50.45925
1991	102.96146
1992	5.56829
1993	4.98376
1994	10.13588
1995	9.65239
1996	3.66974
1997	9.45133
1998	6.5047
1999	3.83415
2000	7.20776
2001	6.04074
2002	6.92067
2003	33.46154
2004	45.16631
2005	5.78125
2006	6.64124
2007	7.63663
2008	10.39169
2009	3.49815
2010	5.44341
2011	8.06076
2012	5.09818
2013	4.69282
2014	2.04665
2015	0.6408
2016	0.87189
2017	3.67263