Year	Percent
1961	-13.07176
1962	18.1518
1963	2.52536
1964	-4.99115
1965	-1.71198
1966	3.8344
1967	-3.76753
1968	1.38149
1969	6.26284
1970	-2.9921
1971	3.15457
1972	-2.49145
1973	5.29989
1974	0.39189
1975	-7.55971
1976	-7.94869
1977	-2.10018
1978	-8.02739
1979	-2.33772
1980	-0.50203
1981	-0.23102
1982	-2.89213
1983	-1.04296
1984	2.944
1985	-2.09389
1986	1.97905
1987	-0.07281
1988	-2.36105
1989	-4.27917
1990	-9.67007
1991	-11.73653
1992	-13.93017
1993	-16.78346
1994	-7.33634
1995	-2.50056
1996	-3.74182
1997	-7.89877
1998	-3.84084
1999	-6.47708
2000	-9.23976
2001	-4.76634
2002	-0.02983
2003	2.38465
2004	3.42924
2005	2.80626
2006	1.98394
2007	2.84974
2008	2.78428
2009	-0.50012
2010	3.59904
2011	3.36577
2012	3.57044
2013	4.92651
2014	5.89642
2015	3.4451
2016	-0.90338
2017	0.38121