Year	Measure
1971	0.00783
1972	0.01005
1973	0.00788
1974	0.00923
1975	0.00903
1976	0.01012
1977	0.01039
1978	0.01493
1979	0.01251
1980	0.01253
1981	0.01339
1982	0.01335
1983	0.01237
1984	0.01104
1985	0.01026
1986	0.01339
1987	0.01441
1988	0.01213
1989	0.0121
1990	0.00953
1991	0.01082
1992	0.01436
1993	0.01458
1994	0.01089
1995	0.01049
1996	0.01045
1997	0.00962
1998	0.00959
1999	0.00661
2000	0.0048
2001	0.00656
2002	0.0103
2003	0.01402
2004	0.01326
2005	0.01985
2006	0.02225
2007	0.02165
2008	0.00595
2009	0.0085
2010	0.01107