Year
.
1969
14 000
16 003
1970
16 000
16 549
1971
18 500
15 936
1972
19 100
15 419
1973
21 200
7330
1974
18 000
22 600
1975
3900
22 476
1976
31 900a
23 638
1977
24 800
25 856
1978
27 900
28 931
a Includes $6 900 000 for the transition quarter.