Year	Percent
1960	6.35665
1961	3.34479
1962	2.7691
1963	2.5275
1964	2.56297
1965	2.43005
1966	2.48619
1967	2.20868
1968	1.72453
1969	1.50453
1970	1.55456
1971	1.83413
1972	1.85221
1973	1.8687
1974	1.66414
1975	1.46027
1976	1.34772
1977	1.38572
1978	1.2097
1979	1.26239
1980	1.26923
1981	4.80769
1982	4.38859
1983	1.29874
1984	1.89022
1985	0.13665
1986	-0.09449
1987	1.50383
1988	2.53777
1989	2.93574
1990	3.88909
1991	2.84548
1992	3.00426
1993	2.52981
1994	3.13659
1995	3.03781
1996	4.06432
1997	3.35744
1998	3.39721
1999	0.79915
2000	1.73204
2001	2.69736
2002	0.91264
2003	-1.47453
2004	1.25192
2005	2.35051
2006	3.12939
2007	4.166
2008	5.32152
2009	3.01595
2010	1.77183
2011	2.0849
2012	2.45339
2013	1.61931
2014	1.29844
2015	1.18638
2016	1.29744
2017	0.0886