Year	Thousands
1950-01-01	208.068
1951-01-01	213.342
1952-01-01	219.410
1953-01-01	225.966
1954-01-01	232.959
1955-01-01	240.403
1956-01-01	248.254
1957-01-01	256.403
1958-01-01	265.139
1959-01-01	274.666
1960-01-01	284.298
1961-01-01	294.229
1962-01-01	304.857
1963-01-01	315.701
1964-01-01	326.689
1965-01-01	336.342
1966-01-01	345.406
1967-01-01	353.913
1968-01-01	361.260
1969-01-01	367.553
1970-01-01	372.353
1971-01-01	376.613
1972-01-01	380.797
1973-01-01	383.018
1974-01-01	380.244
1975-01-01	362.730
1976-01-01	352.377
1977-01-01	360.069
1978-01-01	365.277
1979-01-01	362.861
1980-01-01	354.083
1981-01-01	352.510
1982-01-01	360.090
1983-01-01	367.620
1984-01-01	374.261
1985-01-01	380.421
1986-01-01	384.890
1987-01-01	386.623
1988-01-01	388.564
1989-01-01	392.548
1990-01-01	394.801
1991-01-01	395.362
1992-01-01	396.500
1993-01-01	397.240
1994-01-01	398.770
1995-01-01	402.828
1996-01-01	407.606
1997-01-01	413.388
1998-01-01	419.931
1999-01-01	426.256
2000-01-01	432.485
2001-01-01	438.509
2002-01-01	444.331
2003-01-01	449.931
2004-01-01	455.317
2005-01-01	460.495
2006-01-01	465.610
2007-01-01	470.784
2008-01-01	475.996
2009-01-01	481.267
2010-01-01	486.618