Year	Measure
1971	0.0056
1972	0.00563
1973	0.00457
1974	0.00635
1975	0.00686
1976	0.00693
1977	0.00744
1978	0.00805
1979	0.00847
1980	0.00843
1981	0.00882
1982	0.0089
1983	0.00664
1984	0.01125
1985	0.0127
1986	0.01383
1987	0.01123
1988	0.01321
1989	0.01407
1990	0.0156
1991	0.01527
1992	0.01406
1993	0.01821
1994	0.01944
1995	0.021
1996	0.01525
1997	0.01608
1998	0.01819
1999	0.01927
2000	0.01466
2001	0.01413
2002	0.0121
2003	0.01463
2004	0.01298
2005	0.01495
2006	0.01986
2007	0.01674
2008	0.01734
2009	0.01624
2010	0.02322