Year	Percent
1961	1.5885
1962	-1.73185
1963	-14.57393
1964	8.69432
1965	8.16306
1966	3.22955
1967	2.56187
1968	-0.48801
1969	5.51821
1970	2.89646
1971	1.84865
1972	-4.42437
1973	0.1395
1974	6.54516
1975	7.32029
1976	0.42473
1977	-3.70152
1978	-2.7881
1979	-2.61076
1980	1.22545
1981	1.29116
1982	-13.13613
1983	-6.51741
1984	-4.5719
1985	3.03552
1986	-0.12591
1987	1.82553
1988	-2.82441
1989	-4.29861
1990	-2.73075
1991	5.84506
1992	7.27725
1993	7.44548
1994	7.8281
1995	4.57963
1996	7.80275
1997	6.41565
1998	-1.37684
1999	3.33444
2000	-1.1179
2001	2.39109
2002	1.10194
2003	-1.0017
2004	3.3221
2005	-1.86474
2006	5.31843
2007	7.2678
2008	2.18912
2009	3.63839
2010	4.01806
2011	4.83904
2012	4.7184
2013	4.30941
2014	3.12431
2015	2.47498
2016	2.6763
2017	2.32183