1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965 |
12.7
12.9
13.2
13.5
13.6
13.8
14.1
14.4
14.6
14.9
15.2
15.5
15.7
16.0
17.3
17.9
18.5 |
1,000
2,000
2,000
3,000
1,000
2,000
3,000
3,000
3,000
3,000
3,000
3,000
2,000
2,000
2,000
2,000
7,000 |
--
--
--
--
--
--
--
--
--
--
1,100
1,200
200
300
400
200
650 |
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982 |
19.0
19.2
19.6
20.0
20.2
17.0
16.2
16.3
16.4
18.95
18.2
13.8
13.8
15.5
15.6
--
-- |
5,000
2,000
4,640
4,120
2,243
890
578
1,220
1,350
1,630
551
3,337
2,995
7,400
7,255
4,850
913 |
2,700
1,600
594
384
229
532
679
802
1,231
1,637
1,467
1,621
1,333
1,200
1,092
845
543 |