1946,1.63,17.26
1947,2.16,20.29
1948,2.77,24.21
1949,2.77,24.44
1950,2.77,24.18
1951,2.77,22.42
1952,2.77,21.91
1953,2.92,22.88
1954,2.99,23.39
1955,2.93,22.94
1956,2.94,22.74
1957,3.14,23.46
1958,3.00,21.83
1959,3.00,21.62
1960,2.91,20.69
1961,2.85,20.03
1962,2.85,19.79
1963,2.91,19.97
1964,3.00,20.32
1965,3.01,20.05
1966,3.10,20.06
1967,3.12,19.65
1968,3.18,19.17
1969,3.32,19.02
1970,3.39,18.35
1971,3.60,18.68
1972,3.60,20.03
1973,4.75,22.29
1974,9.35,39.77
1975,12.21,47.63
1976,13.10,48.36
1977,14.40,49.88
1978,14.95,48.17
1979,25.10,71.96
1980,37.42,95.50
1981,35.75,82.70
1982,31.83,69.33
1983,29.08,61.34
1984,28.75,58.14
1985,26.92,52.56
1986,14.44,27.66
1987,17.75,32.81
1988,14.87,26.45
1989,18.33,31.05
1990,23.19,37.17
1991,20.20,31.15
1992,19.25,28.81
1993,16.75,24.36
1994,15.66,22.19
1995,16.75,23.09
1996,20.46,27.38
1997,18.64,24.40
1998,11.91,15.35
1999,16.56,20.83
2000,27.39,33.39
2001,23.00,27.29
2002,22.81,26.61
2003,27.69,31.62
2004,37.66,41.84
2005,50.04,53.77
2006,58.30,60.73
2007,64.20,64.92
2008,134.95,131.26