670
1964
1840
38.8
1965
1740
38.8
1966
1900
34.4
1967
1260
35.5
1968
1700
25.2
1969
1920
24.6
1970
1530
40.0
1971
1310
29.2
1972
1140
43.8
1973
1380
43.2
1974
1690
46.4
1975
1510
31.0
1976
2320
31.6
1977
1670
32.2
1978
1640
34.6
1979
1470
27.0
1980
1380
40.8
1981
1530
40.0
1982
1920
35.7
1983
2630
20.4
1984
1280
18.0
1985
4480
33.0
1986
2010
24.0
1987
1430
38.1
1988
1310
24.6
1989
1010
23.8
1990
1870
30.2
1991
1310
19.0
1992
1140
26.0
1993
1470
26.1
1994
870
26.2
1995
1210
27.5
1996
1530
34.7
1997
1870
41.6
