1955   5402.1   6135.0  18.1
1956   5947.8   6828.4  18.3
1957   6661.0   7619.5  19.0
1958   7147.2   8153.3  19.1
1959   8000.9   9274.3  19.8
1960   9217.7  10776.5  20.5
1961  10818.7  12869.4  21.8
1962  12413.7  14701.4  23.3
1963  14496.3  17042.7  25.0
1964  16668.5  19709.9  26.0
1965  18815.9  22337.4  27.8
1966  21683.2  25514.5  29.0
1967  24923.4  29012.6  30.1
1968  28452.8  34233.6  31.6
1969  32724.5  39486.3  32.9
1970  37804.7  45913.2  35.2
1971  42686.8  51944.3  37.6
1972  49302.0  60245.4  39.8
1973  59650.8  74924.8  44.2
1974  72108.4  93833.2  53.4
1975  83920.0 108712.8  59.5
1976  94845.6 123540.9  65.3
1977 105869.9 135318.4  70.1
1978 116643.0 147244.2  73.4
1979 128558.4 157071.1  76.0
1980 139506.4 169931.5  81.7
1981 147988.3 181349.2  85.5
1982 158853.9 190611.5  87.8
1983 167508.7 199587.8  89.7
1984 176267.1 209451.9  92.0
1985 186234.6 220655.6  94.1
1986 194050.9 229938.8  94.7
1987 203342.3 235924.0  95.2
1988 214991.9 247159.7  95.6
1989 229830.7 263940.5  97.5
1990 246153.6 280133.0 100.0
1991 258331.6 297512.9 102.5
1992 268676.5 309256.6 104.4
1993 274696.1 317021.6 105.7
1994 282354.3 325655.7 106.4
1995 286454.5 331967.5 105.8
1996 295103.7 340619.1 105.9
1997 302014.4 345522.7 107.4