Year	Percent
1961	6.508
1962	6.30861
1963	6.14225
1964	6.05023
1965	5.98503
1966	5.92291
1967	5.81796
1968	5.72777
1969	5.61438
1970	5.50706
1971	5.21955
1972	5.97764
1973	4.99667
1974	5.20708
1975	5.60397
1976	5.23044
1977	5.20386
1978	0.82095
1979	0.82719
1980	0.88126
1981	1.19049
1982	0.55536
1983	-0.15116
1984	0.56253
1985	0.7804
1986	0.59215
1987	4.21577
1988	0.34318
1989	0.60361
1990	0.52993
1991	1.40629
1992	0.57134
1993	2.23087
1994	2.84835
1995	1.68906
1996	1.71888
1997	1.45942
1998	2.27545
1999	2.31645
2000	1.28149
2001	0.50949
2002	3.50964
2003	-0.64771
2004	0.1464
2005	1.01181
2006	2.65748
2007	1.11733
2008	2.87112
2009	1.05658
2010	3.4831
2011	-1.91249
2012	1.72434
2013	2.61257
2014	2.34513
2015	3.01083
2016	2.11263
2017	1.99106