Year	Measure
1971	0.00189
1972	0.0019
1973	0.0017
1974	0.00163
1975	0.00232
1976	0.00261
1977	0.00263
1978	0.00255
1979	0.00249
1980	0.00315
1981	0.00322
1982	0.00314
1983	0.0031
1984	0.00317
1985	0.00348
1986	0.00395
1987	0.00426
1988	0.0045
1989	0.00494
1990	0.00523
1991	0.00564
1992	0.00521
1993	0.00518
1994	0.00443
1995	0.00442
1996	0.00488
1997	0.00397
1998	0.00552
1999	0.00561
2000	0.00541
2001	0.00641
2002	0.00653
2003	0.00596
2004	0.00536
2005	0.00394
2006	0.00309
2007	0.00526
2008	0.0054
2009	0.00519
2010	0.00494