Year	Percent
1961	5.18486
1962	3.68533
1963	4.7359
1964	6.02635
1965	2.84821
1966	1.12398
1967	2.57548
1968	3.05744
1969	4.27429
1970	5.05673
1971	0.25243
1972	1.98692
1973	3.78893
1974	2.89918
1975	2.14625
1976	0.69124
1977	-1.94513
1978	1.45573
1979	3.61365
1980	1.49373
1981	0.33444
1982	1.19078
1983	1.85452
1984	4.13487
1985	1.99177
1986	2.45277
1987	3.00955
1988	2.08876
1989	1.97219
1990	-0.02076
1991	-1.81752
1992	-1.73663
1993	-2.63281
1994	3.35047
1995	3.47992
1996	1.35643
1997	2.84158
1998	4.16895
1999	4.44873
2000	4.56724
2001	1.29111
2002	1.74193
2003	2.00548
2004	3.91104
2005	2.40794
2006	4.10093
2007	2.64098
2008	-1.32873
2009	-5.98896
2010	5.08919
2011	1.89206
2012	-1.02124
2013	0.38696
2014	1.5913
2015	3.42252
2016	1.94596
2017	0.81838