Year	Measure
1960	0.00548
1961	0.01545
1962	0.01205
1963	0.00053
1964	0.01963
1965	0.02568
1966	0.02321
1967	0.02492
1968	0.02511
1969	0.02169
1970	0.02434
1971	0.01381
1972	0.01612
1973	0.0115
1974	0.02007
1975	0.01701
1976	0.01095
1977	0.0192
1978	0.01869
1979	0.02151
1980	0.02314
1981	0.02548
1982	0.0224
1983	0.02168
1984	0.02164
1985	0.0204
1986	0.02334
1987	0.02574
1988	0.02531
1989	0.01938
1990	0.01579
1991	0.01872
1992	0.0154
1993	0.01454
1994	0.0184
1995	0.01857
1996	0.01248
1997	0.01702
1998	0.02325
1999	0.01697
2000	0.02448
2001	0.02309
2002	0.01922
2003	0.01522
2004	0.01983
2005	0.01768
2006	0.0205
2007	0.02115
2008	0.02332
2009	0.01832
2010	0.0183
2011	0.01017