Year	Percent
1961	7.68406
1962	5.0634
1963	5.34524
1964	1.36751
1965	5.97564
1966	4.46808
1967	5.43801
1968	3.93075
1969	5.36973
1970	3.94468
1971	6.54346
1972	1.67403
1973	2.4695
1974	-0.31664
1975	-0.94612
1976	-0.9601
1977	-1.46026
1978	7.07625
1979	1.97822
1980	10.38742
1981	6.64722
1982	2.92135
1983	-6.65612
1984	0.41575
1985	2.63147
1986	1.31717
1987	-3.91651
1988	-15.2188
1989	-0.57323
1990	5.84524
1991	7.15654
1992	5.98234
1993	3.3052
1994	0.76037
1995	-0.3113
1996	1.97253
1997	4.31244
1998	5.1895
1999	1.85827
2000	0.71045
2001	-1.35724
2002	0.29507
2003	2.26018
2004	5.53685
2005	5.23044
2006	6.68437
2007	9.97692
2008	7.90424
2009	-0.54227
2010	3.97366
2011	9.37543
2012	7.88302
2013	5.07855
2014	3.30319
2015	3.83987
2016	3.30034
2017	3.69933