Year	Percent
1961	2.99006
1962	3.00482
1963	3.01392
1964	2.90618
1965	3.07887
1966	0.0416
1967	1.22775
1968	5.7938
1969	1.85392
1970	2.99085
1971	-0.94109
1972	2.51162
1973	13.22797
1974	26.69417
1975	4.31395
1976	18.22297
1977	28.75129
1978	4.4333
1979	6.5414
1980	24.14368
1981	2.97699
1982	8.30132
1983	9.04678
1984	17.9099
1985	0.34366
1986	-2.0204
1987	-4.07521
1988	-0.38093
1989	-1.01241
1990	-4.52327
1991	0.66349
1992	-0.02384
1993	6.15419
1994	46.38607
1995	11.04379
1996	4.98308
1997	6.20168
1998	3.63948
1999	0.78618
2000	2.24582
2001	7.39641
2002	6.66731
2003	4.80102
2004	-2.89062
2005	1.30131
2006	1.74402
2007	2.93314
2008	8.50257
2009	2.34574
2010	5.38642
2011	1.63542
2012	4.1174
2013	2.75171
2014	3.90936
2015	3.10615
2016	1.56835
2017	1.14316