1948   146.631
1949   149.188
1950   152.271
1951   154.878
1952   157.553
1953   160.184
1954   163.026
1955   165.931
1956   168.903
1957   171.984
1958   174.882
1959   177.830
1960   180.671
1961   183.691
1962   186.538
1963   189.242
1964   191.889
1965   194.303
1966   196.560
1967   198.712
1968   200.706
1969   202.677
1970   205.052
1971   207.661
1972   209.896
1973   211.909
1974   213.854
1975   215.973
1976   218.035
1977   220.239
1978   222.585
1979   225.055
1980   227.726
1981   229.966
1982   232.188
1983   234.307
1984   236.348
1985   238.466
1986   240.651
1987   242.804
1988   245.021
1989   247.342
1990   249.913
1991   252.650
1992   255.419
1993   258.137
1994   260.660
1995   263.034