Year	Measure
1971	0.02185
1972	0.02097
1973	0.02558
1974	0.0206
1975	0.02419
1976	0.02901
1977	0.03454
1978	0.02839
1979	0.03222
1980	0.03603
1981	0.035
1982	0.02942
1983	0.03224
1984	0.0313
1985	0.02146
1986	0.02233
1987	0.0244
1988	0.02503
1989	0.02607
1990	0.01831
1991	0.02401
1992	0.0205
1993	0.01953
1994	0.01494
1995	0.02381
1996	0.03034
1997	0.02889
1998	0.03275
1999	0.02934
2000	0.02871
2001	0.01879
2002	0.0239
2003	0.03322
2004	0.03497
2005	0.04819
2006	0.04739
2007	0.03234
2008	0.03199
2009	0.03956
2010	0.05802