Year
.
1970
3 600
3 600
2 700
1971
15 600
15 600
9 850
1972
13 000
13 000
16 960
1973
11 500
11 500
18 455 a
1974
700
---
10 000
1975
4 900 b
---
2 100
a Includes $1 755 000 for operational satellite improvements.
b Includes $3 500 000 for operational satellite improvements.