Year	Measure
1971	0.00832
1972	0.00852
1973	0.00621
1974	0.00681
1975	0.00505
1976	0.00484
1977	0.00646
1978	0.00654
1979	0.00713
1980	0.00666
1981	0.00438
1982	0.00238
1983	0.00195
1984	0.00145
1985	0.00187
1986	0.00242
1987	0.00304
1988	0.00338
1989	0.00409
1990	0.00423
1991	0.00418
1992	0.00323
1993	0.00146
1994	0.00272
1995	0.00195
1996	0.00616
1997	0.00646
1998	0.00544
1999	0.00249
2000	0.00214
2001	0.00257
2002	0.00248
2003	0.00421
2004	0.0046
2005	0.00277
2006	0.0028
2007	0.00254
2008	0.00255
2009	0.00698
2010	0.00933