Year	Measure
1971	0.02853
1972	0.02671
1973	0.01542
1974	0.02589
1975	0.02488
1976	0.02467
1977	0.0246
1978	0.02462
1979	0.02618
1980	0.02615
1981	0.02603
1982	0.01976
1983	0.01689
1984	0.01751
1985	0.01743
1986	0.01667
1987	0.01818
1988	0.01788
1989	0.01481
1990	0.01458
1991	0.01591
1992	0.01977
1993	0.01873
1994	0.02088
1995	0.0178
1996	0.01939
1997	0.02154
1998	0.01852
1999	0.00774
2000	0.01032
2001	0.00753
2002	0.01507
2003	0.02978
2004	0.02409
2005	0.02219
2006	0.01458
2007	0.01217
2008	0.0077
2009	0.01274
2010	0.01706