Year	Measure
1971	0.00115
1972	0.00077
1973	0.00075
1974	0.00074
1975	0.00086
1976	0.00094
1977	0.001
1978	0.00132
1979	0.00162
1980	0.00237
1981	0.00235
1982	0.00238
1983	0.00183
1984	0.00233
1985	0.00211
1986	0.00196
1987	0.00189
1988	0.00239
1989	0.00502
1990	0.00688
1991	0.00792
1992	0.00888
1993	0.00959
1994	0.01092
1995	0.01229
1996	0.01375
1997	0.01317
1998	0.01239
1999	0.01521
2000	0.01589
2001	0.01966
2002	0.01944
2003	0.02006
2004	0.01862
2005	0.01752
2006	0.02087
2007	0.0233
2008	0.026
2009	0.02966
2010	0.02697