Year	Measure
1960	0.00187
1961	0.00176
1962	0.00217
1963	0.00184
1964	0.00197
1965	0.00248
1966	0.00245
1967	0.00259
1968	0.0027
1969	0.00216
1970	0.00468
1971	0.00411
1972	0.00391
1973	0.00375
1974	0.00542
1975	0.00504
1976	0.00413
1977	0.00486
1978	0.00481
1979	0.00441
1980	0.00568
1981	0.00511
1982	0.00366
1983	0.00393
1984	0.00328
1985	0.00428
1986	0.00356
1987	0.0038
1988	0.00408
1989	0.00365
1990	0.0032
1991	0.00321
1992	0.00339
1993	0.00334
1994	0.00388
1995	0.00423
1996	0.00432
1997	0.00439
1998	0.00517
1999	0.00483
2000	0.00473
2001	0.00522
2002	0.00513
2003	0.00376
2004	0.00469
2005	0.00496
2006	0.0046
2007	0.0053
2008	0.00484
2009	0.00534
2010	0.00656
2011	0.00523