Year	Percent
1966	-1.17532
1967	-0.39351
1968	0.19483
1969	0.42543
1970	4.83751
1971	0.80646
1972	0.40032
1973	8.84137
1974	9.64915
1975	9.88798
1976	17.63421
1977	18.32163
1978	0.96001
1979	15.56241
1980	16.95186
1981	7.39748
1982	5.54988
1983	1.59301
1984	3.05236
1985	3.15144
1986	-0.94294
1987	2.36853
1988	3.90649
1989	3.35731
1990	5.10707
1991	7.42011
1992	3.42371
1993	8.59234
1994	9.80652
1995	10.9281
1996	6.57514
1997	3.38685
1998	4.22817
1999	0.9956
2000	3.27452
2001	3.31598
2002	1.50269
2003	2.96888
2004	2.71627
2005	4.26772
2006	4.32676
2007	4.38209
2008	3.52982
2009	-0.0598
2010	2.64617
2011	5.91433
2012	2.54893
2013	0.3804
2014	0.7739
2015	0.18675
2016	0.62439
2017	1.38071