Year
.
1971
---
---
27 803
1972
---
--
32 591
1973
22 800
--- a
--- b
1974
10 000
--- a
--- c
a Authorization figures were not broken down to include this category.
b It was estimated in the FY 1974 budget estimate that $23 500 000 would be programmed in FY 1973.
c The Skylab budget was not broken down by categories in the FY 1975 budget estimate; the total programmed was $176 700 000.