Year	Percent
1961	1.74821
1962	1.43186
1963	4.78095
1964	8.47987
1965	3.83881
1966	2.89558
1967	2.68847
1968	6.14643
1969	0.28169
1970	3.21431
1971	0.50028
1972	4.79645
1973	4.46708
1974	2.54094
1975	2.64505
1976	1.49726
1977	0.62354
1978	6.16271
1979	6.99224
1980	6.63288
1981	6.27312
1982	-2.83199
1983	-6.25451
1984	1.4444
1985	0.4979
1986	-5.67242
1987	-0.12932
1988	-0.70446
1989	2.18901
1990	3.02501
1991	2.17107
1992	1.57915
1993	2.02599
1994	2.95395
1995	-7.98159
1996	4.94117
1997	5.09581
1998	3.52539
1999	1.23826
2000	3.4784
2001	-1.7064
2002	-1.27411
2003	0.21255
2004	2.60441
2005	0.91508
2006	2.9573
2007	0.69632
2008	-0.48083
2009	-6.79735
2010	3.49303
2011	2.12136
2012	2.15128
2013	-0.05838
2014	1.44972
2015	1.90108
2016	1.58236
2017	0.75456