Year	Percent
1961	4.2935
1962	3.75006
1963	2.77498
1964	-0.48536
1965	-1.78719
1966	1.92135
1967	4.86441
1968	6.94538
1969	1.41583
1970	3.03612
1971	2.14162
1972	9.88567
1973	6.26943
1974	37.47215
1975	14.65815
1976	-5.77655
1977	1.67957
1978	14.78779
1979	6.56294
1980	11.77879
1981	4.34074
1982	4.3024
1983	8.91968
1984	19.28175
1985	14.5101
1986	12.29336
1987	58.71082
1988	23.64604
1989	162.62265
1990	56.39717
1991	126.7371
1992	13.5
1993	15.5
1994	19.70001
1995	12.40001
1996	3.99999
1997	1.39906
1998	3.00096
1999	11.2
2000	6.60001
2001	-1.88756
2002	4.51385
2003	5.48587
2004	4.89391
2005	7.89859
2006	68.44368
2007	12.70264
2008	9.02037
2009	3.69874
2010	5.73421
2011	7.92457
2012	5.69331
2013	0.01686
2014	-0.39092
2015	-0.23904
2016	7.12333
2017	1.91672