Year	Measure
1960	0.7497
1961	0.8032
1962	0.8982
1963	0.9327
1964	1.031
1965	1.142
1966	1.117
1967	1.211
1968	1.357
1969	1.282
1970	1.282
1971	1.392
1972	1.473
1973	1.582
1974	1.653
1975	1.659
1976	1.75
1977	1.532
1978	1.71
1979	1.873
1980	1.76
1981	1.948
1982	1.934
1983	2.203
1984	2.201
1985	2.12
1986	1.985
1987	2.122
1988	2.227
1989	2.412
1990	2.456
1991	2.221
1992	2.341
1993	2.379
1994	2.215
1995	2.397
1996	2.037
1997	2.139
1998	2.241
1999	2.339
2000	2.715
2001	2.295
2002	2.453
2003	1.99
2004	2.039
2005	2.524
2006	2.198
2007	2.434
2008	2.502
2009	2.228
2010	2.07
2011	2.109