Year	Measure
1971	0.01179
1972	0.0118
1973	0.01154
1974	0.01341
1975	0.01455
1976	0.01677
1977	0.01852
1978	0.01867
1979	0.01862
1980	0.01875
1981	0.01908
1982	0.01911
1983	0.01748
1984	0.01675
1985	0.0147
1986	0.01538
1987	0.014
1988	0.01422
1989	0.01541
1990	0.01502
1991	0.01469
1992	0.01414
1993	0.01502
1994	0.01546
1995	0.01581
1996	0.01574
1997	0.01605
1998	0.01609
1999	0.01897
2000	0.01741
2001	0.01888
2002	0.01576
2003	0.01566
2004	0.01492
2005	0.01465
2006	0.01471
2007	0.01733
2008	0.01612
2009	0.01387
2010	0.01383