Year	Percent
1961	4.35258
1962	6.93151
1963	1.36947
1964	3.53046
1965	2.6493
1966	5.21469
1967	0.97125
1968	-2.60148
1969	0.69889
1970	0.58738
1971	1.81812
1972	0.77053
1973	3.51717
1974	6.54618
1975	1.58132
1976	-1.21203
1977	-2.28393
1978	-5.17965
1979	1.42359
1980	3.29238
1981	2.98078
1982	-2.59419
1983	-12.4952
1984	1.22608
1985	-0.26454
1986	6.95632
1987	7.28256
1988	-11.42563
1989	-14.19542
1990	-6.97549
1991	0.1253
1992	-2.52614
1993	3.21366
1994	10.23936
1995	5.53739
1996	1.10684
1997	4.81997
1998	-1.86331
1999	0.05932
2000	1.29322
2001	-0.70963
2002	4.10529
2003	2.8647
2004	3.66723
2005	4.98696
2006	6.22265
2007	7.20364
2008	7.7959
2009	-0.15744
2010	6.95998
2011	4.94686
2012	4.73559
2013	4.4439
2014	1.02866
2015	1.92417
2016	2.65193
2017	1.27906