Year	Percent
1961	7.59141
1962	4.96778
1963	6.6941
1964	3.75054
1965	5.34825
1966	-2.58811
1967	-1.35741
1968	13.83666
1969	10.64465
1970	3.80739
1971	1.89158
1972	9.3322
1973	1.40004
1974	3.35471
1975	0.91201
1976	-1.89237
1977	-1.20185
1978	3.35245
1979	3.51475
1980	-0.74154
1981	3.26295
1982	0.18317
1983	1.49587
1984	-0.37729
1985	2.2182
1986	2.59058
1987	5.42312
1988	1.21879
1989	-1.11708
1990	4.04508
1991	1.43538
1992	4.09928
1993	1.3857
1994	4.68196
1995	3.79607
1996	2.59457
1997	1.10361
1998	1.81146
1999	1.01064
2000	5.3483
2001	-2.30485
2002	-1.83531
2003	-1.03549
2004	2.73756
2005	2.31377
2006	3.36724
2007	3.91149
2008	1.17488
2009	-1.01289
2010	3.31917
2011	2.74144
2012	0.07776
2013	2.1864
2014	1.44406
2015	1.01656
2016	2.07359
2017	1.35801