Year
.
1969
18 000
22 826
1970
17 400
18 291
1971
15 500
18 001
1972
12 750
9 969
1973
15 310
15 388
1974
15 165
8 235
1975
15 230
5 917
1976
10 500 a
6 309
1977
5 300
3 798
1978
4 800
3 700
a Includes $2 500 000 for the transition quarter.