Year
.
1969
3000
1742
1970
2200
1816
1971
2800
3648
1972
2200
2434
1973
2800
2400
1974
2300
2274
1975
3200
3160
1976
3800a
3284
1977
3900
4014
1978
3500
3433
a Includes $800 000 for the transition quarter.