Year	Percent
1961	0.03628
1962	0.2865
1963	1.52572
1964	1.9
1965	2.2316
1966	7.36065
1967	8.55746
1968	5.24929
1969	4.93754
1970	5.65136
1971	3.41353
1972	7.13257
1973	19.73751
1974	8.92003
1975	2.26931
1976	19.71806
1977	7.43783
1978	-2.03047
1979	16.09984
1980	7.09132
1981	-1.3036
1982	3.6788
1983	18.65996
1984	7.43829
1985	1.62014
1986	1.35687
1987	7.9716
1988	7.92424
1989	-2.54065
1990	4.13823
1991	6.99485
1992	2.87598
1993	-2.4958
1994	7.25309
1995	15.85133
1996	1.81188
1997	8.42636
1998	14.54385
1999	11.06889
2000	13.10242
2001	6.91391
2002	12.29043
2003	5.53934
2004	-1.99237
2005	12.18238
2006	64.43953
2007	0.3413
2008	11.66268
2009	-4.88334
2010	9.92161
2011	8.83307
2012	-0.56512
2013	3.58049
2014	3.0496
2015	-4.40322
2016	7.11107
2017	5.51374