Year	Measure
1971	0.0117
1972	0.00965
1973	0.01048
1974	0.01168
1975	0.00581
1976	0.0039
1977	0.00801
1978	0.01273
1979	0.01936
1980	0.01747
1981	0.00993
1982	0.0081
1983	0.01419
1984	0.01515
1985	0.02015
1986	0.02092
1987	0.01903
1988	0.02157
1989	0.0233
1990	0.02657
1991	0.02014
1992	0.02214
1993	0.02337
1994	0.02198
1995	0.02206
1996	0.02796
1997	0.02104
1998	0.02291
1999	0.0257
2000	0.01701
2001	0.01678
2002	0.01635
2003	0.02098
2004	0.0198
2005	0.02372
2006	0.02777
2007	0.02451
2008	0.02859
2009	0.02101
2010	0.02893