445
1964
765
24.6
1965
865
22.3
1966
940
30.2
1967
1160
20.2
1968
5210
22.0
1969
540
28.5
1970
580
26.4
1971
590
26.8
1972
615
24.2
1973
870
35.0
1974
1360
28.6
1975
658
36.3
1976
540
27.9
1977
725
24.7
1978
825
28.4
1979
725
26.9
1980
775
26.1
1981
600
34.3
1982
650
29.3
1983
688
25.4
1984
700
29.3
1985
618
26.8
1986
624
27.4
1987
662
28.0
1988
744
25.0
1989
610
32.7
1990
863
26.9
1991
744
24.6
1992
908
22.9
1993
942
22.4
1994
728
23.4
1995
964
25.0
1996
978
29.7
1997
744
41.4
