Year	Percent
1970	1.64738
1971	0.01182
1972	0.6136
1973	0.58519
1974	2.71013
1975	0.76488
1976	1.05481
1977	0.85091
1978	0.51263
1979	0.07729
1980	0.8234
1981	0.02978
1982	-0.1185
1983	0.00086
1984	0.00149
1985	0.00069
1986	0.00835
1987	0.00556
1988	0.02203
1989	0.02174
1990	0.00054
1991	0.02546
1992	0.0625
1996	0.57518
1997	0.53967
1998	1.25883
1999	0.5995
2000	0.51122
2001	2.03327
2002	1.87631
2003	0.93994
2004	1.03352
2005	1.12017
2006	1.57314
2007	1.24965
2008	1.54304
2009	2.00198
2010	1.42696
2011	1.2855
2012	0.71769
2013	0.8066
2014	0.70259
2015	-0.32422
2016	1.03004
2017	0.70491