Year
.
1969
4300
3439
1970
3600
3937
1971
3100
3769
1972
3300
4536
1973
3100
3330
1974
3200
3007
1975
3300
2700
1976
3400a
2523
1977
2600
2846
1978
3000
3095
a Includes $700 000 for the transition quarter.