Year	Percent
1966	4.14706
1967	2.52991
1968	0.44509
1969	0.73471
1970	0.28572
1971	1.19445
1972	3.45864
1973	2.30811
1974	2.85729
1975	0.59553
1976	2.766
1977	4.55347
1978	3.23534
1979	-5.96412
1980	-13.30041
1981	-11.88707
1982	-7.7007
1983	0.11178
1984	-0.0319
1985	-0.71835
1986	-1.11762
1987	1.19972
1988	0.57746
1989	-0.3404
1990	3.45426
1991	0.1287
1992	5.55805
1993	4.39512
1994	3.35033
1995	3.49986
1996	-0.26321
1997	2.12966
1998	1.74907
1999	1.34535
2000	0.39464
2001	0.22252
2002	0.99362
2003	1.03105
2004	0.39918
2005	2.2273
2006	3.86882
2007	1.40855
2008	1.67886
2009	-2.51376
2010	1.65321
2011	3.34353
2012	2.34
2013	1.89154
2014	1.4855
2015	1.87017
2016	2.05926
2017	1.79106