Year	Percent
1967	-3.74504
1968	-2.27798
1969	3.00815
1970	3.4677
1971	4.0652
1972	3.58422
1973	6.03939
1974	23.89824
1975	0.93132
1976	4.97659
1977	10.77097
1978	8.41721
1979	7.34461
1980	33.02313
1981	9.47048
1982	6.29835
1983	6.9702
1984	6.20115
1985	8.95364
1986	7.49075
1987	3.01481
1988	3.6706
1989	2.91998
1990	7.69436
1991	5.39632
1992	4.58788
1993	3.03498
1994	0.65534
1995	7.5384
1996	0.43549
1997	0.71339
1998	0.39132
1999	0.56955
2000	-0.74229
2001	0.65232
2002	1.20854
2003	1.06261
2004	1.21922
2005	1.19054
2006	1.54803
2007	3.59505
2008	4.5305
2009	0.14691
2010	0.97562
2011	-0.69098
2012	0.36934
2013	1.30729
2014	0.19558
2015	1.70893
2016	2.20159
2017	0