Year	Measure
1971	0.00425
1972	0.00403
1973	0.0042
1974	0.00395
1975	0.0046
1976	0.0047
1977	0.00501
1978	0.00607
1979	0.00572
1980	0.00572
1981	0.00595
1982	0.00568
1983	0.00573
1984	0.00605
1985	0.00559
1986	0.00577
1987	0.00498
1988	0.00594
1989	0.00624
1990	0.00705
1991	0.00702
1992	0.0066
1993	0.00653
1994	0.00752
1995	0.00647
1996	0.00603
1997	0.00642
1998	0.00701
1999	0.00671
2000	0.00607
2001	0.00592
2002	0.00506
2003	0.00586
2004	0.00649
2005	0.00767
2006	0.00845
2007	0.00883
2008	0.00796
2009	0.00742
2010	0.00803