Year	Measure
1971	0.00174
1972	0.00252
1973	0.00286
1974	0.00302
1975	0.00316
1976	0.00345
1977	0.00314
1978	0.00313
1979	0.00331
1980	0.00308
1981	0.00307
1982	0.00318
1983	0.00318
1984	0.00328
1985	0.00338
1986	0.0039
1987	0.00393
1988	0.00381
1989	0.00374
1990	0.00391
1991	0.00413
1992	0.00422
1993	0.00412
1994	0.00413
1995	0.00349
1996	0.00375
1997	0.00359
1998	0.00346
1999	0.00392
2000	0.00374
2001	0.00392
2002	0.00388
2003	0.00343
2004	0.00319
2005	0.00355
2006	0.00376
2007	0.00388
2008	0.00382
2009	0.00828
2010	0.00968