Year	Percent
1961	0.145
1962	3.55448
1963	4.37305
1964	2.76051
1965	3.55608
1966	4.39236
1967	4.77789
1968	-13.93494
1969	1.0048
1970	-2.53069
1971	2.8981
1972	5.727
1973	3.52619
1974	0.76286
1975	5.0169
1976	2.35515
1977	2.68786
1978	-0.17221
1979	-2.04177
1980	-3.49715
1981	-1.8667
1982	-5.97321
1983	-6.0511
1984	-2.2594
1985	-3.67172
1986	-4.51602
1987	0.45313
1988	0.91064
1989	1.7792
1990	2.603
1991	3.21499
1992	-0.33729
1993	2.23205
1994	2.62106
1995	2.63287
1996	2.32307
1997	2.90853
1998	2.99584
1999	-1.49333
2000	0.58045
2001	-0.19352
2002	0.6265
2003	0.88017
2004	2.34578
2005	2.61725
2006	3.01424
2007	2.81331
2008	4.3969
2009	1.67413
2010	2.45227
2011	3.53286
2012	3.47279
2013	5.1401
2014	3.84409
2015	3.26795
2016	2.70131
2017	2.65166