|
YEAR |
|
|
|
. | ||
|
1956 |
|
. |
|
1957 |
|
. |
|
1958 |
|
. |
|
1959 |
|
. |
|
1960 |
|
. |
|
1961 |
|
. |
|
1962 |
|
. |
|
1963 |
|
|
|
1964 |
|
|
|
1965 |
|
. |
|
1966 |
|
. |
|
1974 |
|
. |
Data from, Data Book 1, 498 table 6-145; various Congressional hearings; NASA Factbook, 327. Information on contractors is scarce.