Year	Percent
1960	4.00663
1961	-0.3989
1962	-0.41593
1963	-0.41767
1964	-0.40385
1965	-0.76557
1966	-1.13566
1967	-1.16475
1968	-1.17848
1969	-1.1761
1970	-0.5437
1971	0.01652
1972	-0.08262
1973	-0.08269
1974	-0.06753
1975	0.73439
1976	0.50886
1977	0.39038
1978	1.04092
1979	1.0136
1980	1.0486
1981	0.73534
1982	2.14498
1983	1.40948
1984	0.02087
1985	1.75675
1986	1.6709
1987	0.68861
1988	0.82104
1989	0.97329
1990	0.97831
1991	2.69509
1992	1.03164
1993	0.99876
1994	0.93526
1995	0.69714
1996	0.65652
1997	0.75679
1998	0.64994
1999	0.59286
2000	0.64527
2001	0.75111
2002	0.74551
2003	0.65773
2004	0.67163
2005	0.63744
2006	0.36434
2007	0.34876
2008	0.65066
2009	0.75391
2010	0.49118
2011	0.4237
2012	0.89921
2013	1.40405
2014	1.99675
2015	2.3864
2016	2.28862
2017	2.15856