Year	Percent
1961	0.68681
1962	2.43266
1963	4.45524
1964	4.53401
1965	-2.06544
1966	4.14308
1967	2.38156
1968	-0.01159
1969	-1.53887
1970	0.12816
1971	6.27195
1972	7.12222
1973	16.51272
1974	12.68437
1975	15.00437
1976	6.03064
1977	6.38654
1978	2.4892
1979	12.23492
1980	6.54745
1981	7.2651
1982	10.08596
1983	7.2558
1984	10.91261
1985	10.24493
1986	7.26025
1987	10.46213
1988	5.38319
1989	7.97612
1990	2.64248
1991	41.41311
1992	5.74194
1993	11.91288
1994	11.0926
1995	2.84192
1996	1.85706
1997	12.07706
1998	18.45161
1999	5.49492
2000	5.40367
2001	5.03804
2002	7.95446
2003	7.79243
2004	11.75291
2005	9.55535
2006	18.45708
2007	3.36551
2008	9.43962
2009	1.12131
2010	18.87757
2011	15.90374
2012	0.98775
2013	3.01269
2014	-9.1562
2015	-4.86608
2016	4.09999
2017	4.19995