Year	Percent
1960	2.02808
1961	2.44255
1962	2.65025
1963	2.6635
1964	2.69977
1965	2.59279
1966	2.2915
1967	1.97556
1968	2.09349
1969	2.19041
1970	2.08653
1971	2.0552
1972	1.93617
1973	1.75659
1974	1.64965
1975	1.55779
1976	1.47476
1977	1.48348
1978	1.42177
1979	1.09441
1980	0.91083
1981	1.00985
1982	1.0226
1983	0.98747
1984	0.95169
1985	0.96277
1986	1.03706
1987	1.07068
1988	0.91201
1989	0.43322
1990	-0.19154
1991	-0.7622
1992	-2.08634
1993	-2.83713
1994	-2.40356
1995	-2.051
1996	-1.74462
1997	-1.4094
1998	-1.23269
1999	0.02162
2000	0.23183
2001	-0.81877
2002	-0.81557
2003	-0.81159
2004	-0.78209
2005	-0.75679
2006	-0.77609
2007	-0.64297
2008	-0.45524
2009	-0.38019
2010	-0.41726
2011	-0.49324
2012	-0.34475
2013	-0.13835
2014	-0.04668
2015	0.28063
2016	0.24372
2017	0.20076