Year	Measure
1971	0.0086
1972	0.00946
1973	0.01107
1974	0.01139
1975	0.01231
1976	0.00541
1977	0.00526
1978	0.00632
1979	0.00645
1980	0.0067
1981	0.00647
1982	0.00662
1983	0.00585
1984	0.00588
1985	0.00665
1986	0.00647
1987	0.0063
1988	0.00615
1989	0.00607
1990	0.00603
1991	0.00623
1992	0.00656
1993	0.00673
1994	0.00655
1995	0.00639
1996	0.00639
1997	0.00588
1998	0.00694
1999	0.00569
2000	0.00563
2001	0.00608
2002	0.0066
2003	0.00692
2004	0.00943
2005	0.01157
2006	0.01347
2007	0.01225
2008	0.01494
2009	0.01434
2010	0.01593