Year	Percent
1961	-0.00003
1962	0.00001
1963	0.00002
1964	-0.00001
1965	5.19692
1966	2.73347
1967	-5.85071
1968	6.66698
1969	14.16496
1970	-2.14247
1971	-6.92937
1972	5.95028
1973	23.22516
1974	14.16091
1975	8.86874
1976	8.28421
1977	19.74695
1978	23.85011
1979	11.53571
1980	-6.00873
1981	8.69831
1982	18.50163
1983	19.43896
1984	39.76726
1985	68.88971
1986	78.5038
1987	165.67664
1988	64.28825
1989	61.49128
1990	70.59155
1991	128.76167
1992	82.02358
1993	26.73632
1994	25.06204
1995	33.59799
1996	29.58049
1997	2.25277
1998	23.77512
1999	17.19385
2000	3.28114
2001	73.83711
2002	-3.91622
2003	13.14347
2004	12.81586
2005	16.62996
2006	12.32894
2007	6.79633
2008	9.99371
2009	7.78176
2010	17.17712
2011	17.37418
2012	12.04108
2013	6.92515
2014	1.79731
2015	18.86476
2016	1.77562
2017	14.67784