Year	Percent
1966	0.1457
1967	0.84034
1968	-0.01138
1969	3.56228
1970	-0.2565
1971	2.72489
1972	-1.13793
1973	0.07007
1974	1.80219
1975	0.88692
1976	0.29472
1977	1.43801
1978	0.32454
1979	2.73719
1980	0.98608
1981	3.40289
1982	3.61712
1983	-2.64945
1984	1.31964
1985	-4.70896
1986	5.81368
1987	2.33762
1988	-1.92736
1989	5.55401
1990	22.24445
1991	62.23067
1992	1310.31458
1993	15444.38414
1994	6041.5949
1995	162.72513
1996	43.03263
1997	6.53798
1998	6.93623
1999	9.72661
2000	4.67964
2001	5.37692
2002	5.91966
2003	3.42457
2004	8.36752
2005	7.92726
2006	8.48486
2007	9.69284
2008	9.70741
2009	-2.13643
2010	8.54733
2011	9.45372
2012	1.07121
2013	-0.76229
2014	3.78048
2015	5.88677
2016	4.18916
2017	6.48583