Year	Percent
1970	1.88541
1971	7.05184
1972	0.00196
1973	0.16627
1974	0.5401
1975	0.36294
1976	0.00609
1977	0.05584
1978	0.21989
1979	0.08113
1980	0.13846
1981	0.04364
1982	0.04884
1983	0.01469
1984	-0.22284
1985	0.12952
1986	-0.02909
1987	-0.05453
1988	-0.34166
1989	-0.02312
1990	0.0663
1991	0.618
1992	0.51765
1993	1.00676
1994	1.78793
1995	1.14968
1996	3.74056
1997	3.70276
1998	3.38648
1999	0.91381
2000	1.41668
2001	1.68498
2002	3.22211
2003	2.65542
2004	3.77818
2005	5.61413
2006	5.74881
2007	5.89622
2008	3.27806
2009	8.30764
2010	3.73261
2011	0.55939
2012	0.21189
2013	-0.42288
2014	0.50449
2015	0.65043
2016	0.50764
2017	0.58828