Year	Percent
1961	4.68867
1962	5.84786
1963	5.44729
1964	6.2518
1965	7.90813
1966	4.86575
1967	8.22881
1968	9.3421
1969	3.04129
1970	13.61509
1971	7.08408
1972	8.18248
1973	11.16628
1974	-0.25817
1975	-7.91461
1976	3.90271
1977	4.48729
1978	1.71259
1979	4.51254
1980	3.46437
1981	0.7408
1982	1.51289
1983	-0.6352
1984	-2.25658
1985	2.52661
1986	4.04628
1987	6.41006
1988	7.6009
1989	6.59607
1990	4.17733
1991	4.60903
1992	1.1681
1993	-2.16302
1994	0.69352
1995	3.92237
1996	3.10827
1997	3.96103
1998	4.2635
1999	3.30225
2000	3.06057
2001	1.2269
2002	0.21843
2003	-1.30541
2004	1.56841
2005	0.58
2006	1.37009
2007	2.291
2008	0.0549
2009	-3.07055
2010	1.85192
2011	-1.68235
2012	-3.63838
2013	-0.58605
2014	1.43866
2015	2.24463
2016	1.94049
2017	2.99637