Year	Percent
1961	1.1606
1962	1.08963
1963	1.34376
1964	1.5053
1965	2.01173
1966	3.77132
1967	4.71307
1968	5.16348
1969	8.92537
1970	6.14535
1971	4.58255
1972	6.78666
1973	5.55102
1974	13.23271
1975	10.65638
1976	2.38967
1977	1.7287
1978	2.24788
1979	8.5541
1980	10.00687
1981	17.68833
1982	3.69501
1983	5.97697
1984	3.17144
1985	8.46073
1986	4.66039
1987	6.58635
1988	1.48431
1989	1.81317
1990	5.07371
1991	2.55654
1992	3.90557
1993	-0.85198
1994	2.18337
1995	0.80244
1996	0.98424
1997	71.91494
1998	3.04923
1999	4.95093
2000	0.92191
2001	0.35347
2002	3.96087
2003	1.15468
2004	1.19453
2005	5.05675
2006	0.82794
2007	2.94751
2008	1.48894
2009	-1.03655
2010	-0.39268
2011	-0.85834
2012	3.26748
2013	-0.45802
2014	3.25511
2015	6.50753
2016	2.11969
2017	1.27533