Year	Measure
1971	0.01418
1972	0.01379
1973	0.0147
1974	0.01288
1975	0.01367
1976	0.01435
1977	0.01413
1978	0.01349
1979	0.013
1980	0.0135
1981	0.0129
1982	0.01242
1983	0.01313
1984	0.01338
1985	0.01392
1986	0.01415
1987	0.01369
1988	0.01329
1989	0.01693
1990	0.01329
1991	0.01195
1992	0.0132
1993	0.01157
1994	0.01067
1995	0.01202
1996	0.01156
1997	0.00932
1998	0.00855
1999	0.00941
2000	0.01039
2001	0.01007
2002	0.01001
2003	0.00979
2004	0.01092
2005	0.01107
2006	0.01094
2007	0.01106
2008	0.01029
2009	0.01044
2010	0.01023