Year	Percent
1960	0
1961	-7.59222
1962	-8.31127
1963	-7.11614
1964	-7.66319
1965	-3.44012
1966	-3.53592
1967	4.65267
1968	5.38317
1969	8.82338
1970	7.70363
1971	4.20149
1972	7.944
1973	6.31306
1974	4.79255
1975	5.59197
1976	10.6799
1977	6.53349
1978	1.0142
1979	1.29292
1980	-0.51664
1981	-1.51805
1982	0.56427
1983	1.80504
1984	8.00253
1985	10.03926
1986	9.1035
1987	10.41366
1988	8.92601
1989	11.46288
1990	8.53792
1991	6.79957
1992	5.20015
1993	6.74622
1994	1.15719
1995	-4.48103
1996	-1.48474
1997	-3.35734
1998	0.53613
1999	5.16484
2000	4.40889
2001	4.69041
2002	8.15707
2003	9.0973
2004	8.71074
2005	12.21662
2006	11.16166
2007	10.67535
2008	10.17355
2009	7.87256
2010	5.87463
2011	3.85013
2012	1.1306
2013	0.6001
2014	0.20496
2015	2.38925
2016	2.29005
2017	0.91008