Year	Percent
1961	4.10415
1962	5.17605
1963	3.87063
1964	5.12739
1965	3.57498
1966	4.20383
1967	3.85186
1968	3.52582
1969	6.24007
1970	4.75323
1971	4.45179
1972	3.59641
1973	5.35154
1974	3.43749
1975	-1.65576
1976	3.76167
1977	3.03018
1978	3.63154
1979	3.21607
1980	1.20235
1981	0.63216
1982	2.00772
1983	0.71977
1984	0.95908
1985	1.04188
1986	1.74751
1987	1.95293
1988	4.0931
1989	3.73228
1990	2.33341
1991	0.95887
1992	1.09573
1993	-1.04236
1994	1.96513
1995	1.71697
1996	1.02964
1997	1.97595
1998	3.1752
1999	2.87648
2000	3.16612
2001	1.21513
2002	0.38576
2003	0.10747
2004	2.03237
2005	0.84467
2006	1.66366
2007	1.73014
2008	-0.36309
2009	-3.43941
2010	1.46316
2011	1.58671
2012	-0.301
2013	0.05983
2014	0.46439
2015	0.64665
2016	0.78447
2017	1.42668