Year	Measure
1971	0.00153
1972	0.00171
1973	0.00176
1974	0.00169
1975	0.00165
1976	0.00182
1977	0.002
1978	0.00201
1979	0.00206
1980	0.00208
1981	0.00221
1982	0.00233
1983	0.00245
1984	0.00245
1985	0.00239
1986	0.00244
1987	0.00235
1988	0.00211
1989	0.00276
1990	0.00261
1991	0.00267
1992	0.00323
1993	0.00358
1994	0.00334
1995	0.00331
1996	0.00332
1997	0.00334
1998	0.00186
1999	0.00201
2000	0.00362
2001	0.00346
2002	0.00398
2003	0.00389
2004	0.00449
2005	0.00556
2006	0.00613
2007	0.00663
2008	0.00741
2009	0.00949
2010	0.00915