Year	Measure
1960	0.01421
1961	0.01396
1962	0.01324
1963	0.01288
1964	0.01264
1965	0.01614
1966	0.01776
1967	0.01709
1968	0.01734
1969	0.01448
1970	0.01928
1971	0.01476
1972	0.01445
1973	0.01666
1974	0.01928
1975	0.01864
1976	0.01514
1977	0.01922
1978	0.0201
1979	0.02015
1980	0.02094
1981	0.02191
1982	0.02177
1983	0.02067
1984	0.02045
1985	0.01923
1986	0.02052
1987	0.02242
1988	0.02205
1989	0.01992
1990	0.01894
1991	0.01607
1992	0.01863
1993	0.019
1994	0.02103
1995	0.02286
1996	0.02297
1997	0.01813
1998	0.01798
1999	0.02052
2000	0.02269
2001	0.02373
2002	0.02412
2003	0.02008
2004	0.02196
2005	0.0204
2006	0.02076
2007	0.02178
2008	0.02183
2009	0.01947
2010	0.02134
2011	0.01923