Year
.
1969
12 000
14 291
1970
12 500
13 168
1971
21 700
20 628
1972
13 000
13 335
1973
12 200
11 100
1974
12 500
13 283
1975
12 000
13 351
1976
19 700a
10 886
1977
14 000
13 940
1978
12 700
11 640
a Includes $5 400 000 for the transition quarter.