Year	Percent
1961	4.04553
1962	4.20364
1963	1.90205
1964	6.2345
1965	7.8096
1966	3.36832
1967	1.59103
1968	1.81451
1969	5.59565
1970	8.07839
1971	3.62853
1972	2.9736
1973	3.8079
1974	-0.05019
1975	-3.49423
1976	-5.97523
1977	-1.89602
1978	5.58434
1979	-0.96668
1980	-4.9972
1981	-3.03306
1982	-2.42433
1983	0.38539
1984	-3.05318
1985	1.24093
1986	1.97534
1987	0.1522
1988	0.32374
1989	-3.87902
1990	-5.42739
1991	6.82376
1992	11.02482
1993	15.26325
1994	3.28974
1995	-5.75558
1996	4.98458
1997	-6.37389
1998	-6.24743
1999	-0.75721
2000	-4.97512
2001	-2.63619
2002	-2.64822
2003	-0.35838
2004	0.20724
2005	3.76492
2006	-0.16497
2007	8.45524
2008	-2.63392
2009	4.34182
2010	7.63361
2011	-1.13351
2012	2.37419
2013	1.61424
2014	12.99688
2015	3.11797
2016	-0.18169
2017	0.14178