Year	Measure
1971	0.0025
1972	0.00285
1973	0.0028
1974	0.00362
1975	0.00414
1976	0.00358
1977	0.00443
1978	0.00612
1979	0.00718
1980	0.0056
1981	0.00722
1982	0.00731
1983	0.0082
1984	0.00783
1985	0.00882
1986	0.00709
1987	0.00777
1988	0.00912
1989	0.00937
1990	0.00908
1991	0.00983
1992	0.0096
1993	0.00996
1994	0.0099
1995	0.00992
1996	0.01023
1997	0.00968
1998	0.00948
1999	0.00687
2000	0.00364
2001	0.00644
2002	0.00814
2003	0.00829
2004	0.00711
2005	0.00731
2006	0.00771
2007	0.008
2008	0.00637
2009	0.00473
2010	0.00727