Year	Measure
1971	0.01788
1972	0.01844
1973	0.01843
1974	0.01913
1975	0.0194
1976	0.01985
1977	0.02047
1978	0.02117
1979	0.02113
1980	0.01708
1981	0.01817
1982	0.01761
1983	0.01722
1984	0.01717
1985	0.01648
1986	0.01573
1987	0.01466
1988	0.01571
1989	0.01542
1990	0.01524
1991	0.01644
1992	0.0156
1993	0.01809
1994	0.01549
1995	0.01454
1996	0.01604
1997	0.01724
1998	0.01678
1999	0.01887
2000	0.02013
2001	0.0216
2002	0.02191
2003	0.01938
2004	0.02057
2005	0.01846
2006	0.01995
2007	0.02107
2008	0.02065
2009	0.0202
2010	0.01889