| Since | Answer | % Correct |
|---|---|---|
| 1968 | Kansas | 88%
|
| 1968 | Idaho | 75%
|
| 1968 | Utah | 75%
|
| 1968 | Nebraska | 63%
|
| 1968 | North Dakota | 63%
|
| 1968 | Oklahoma | 63%
|
| 1968 | South Dakota | 63%
|
| 1968 | Alaska | 50%
|
| 1968 | Wyoming | 50%
|
| 1976 | Minnesota | 25%
|