Year	Percent
1960	3.06201
1961	3.77625
1962	3.37774
1963	3.38344
1964	3.32481
1965	3.07802
1966	3.13685
1967	3.01221
1968	2.94541
1969	2.67822
1970	2.22395
1971	2.08626
1972	2.15703
1973	2.10197
1974	2.19837
1975	2.1025
1976	1.99372
1977	1.92263
1978	1.82902
1979	1.84404
1980	1.82447
1981	1.87321
1982	1.97452
1983	2.07968
1984	2.01433
1985	1.86936
1986	1.89163
1987	1.90236
1988	1.76496
1989	2.09018
1990	1.92448
1991	1.63531
1992	1.15382
1993	0.02879
1994	-0.03543
1995	0.9983
1996	1.48009
1997	1.4585
1998	1.53404
1999	1.48607
2000	1.19113
2001	0.94886
2002	0.9179
2003	1.04844
2004	1.21011
2005	1.12786
2006	1.07505
2007	0.95359
2008	0.95022
2009	1.20727
2010	1.19286
2011	1.21689
2012	1.66524
2013	1.98474
2014	2.00611
2015	2.05903
2016	2.03722
2017	1.98687