Year
.
1969
6 700
5 627
1970
6 300
5 275
1971
5 300
5 598
1972
5 100
5 343
1973
4 500
3 330
1974
5 300
4 300
1975
3 300
4 197
1976
5 200a
3 865
1977
4 200
4 334
1978
4 600
4 982
a Includes $1 100 000 for the transition quarter.