| Last | State | % Correct |
|---|---|---|
| 2009 | British Columbia | 100%
|
| 2019 | California | 100%
|
| 2018 | Colorado | 100%
|
| 2019 | New York | 100%
|
| 2019 | Quebec | 100%
|
| 1982 | Washington | 100%
|
| 2019 | Alberta | 90%
|
| 1977 | Idaho | 90%
|
| 2019 | Ontario | 90%
|
| 2004 | Oregon | 90%
|
| 2018 | Vermont | 90%
|
| 1975 | Wyoming | 90%
|
| 1984 | Alaska | 80%
|
| 2009 | Maine | 80%
|
| 1985 | Minnesota | 80%
|
| 1991 | New Hampshire | 80%
|
| 2017 | Utah | 80%
|
| 2016 | Massachusetts | 70%
|
| 2000 | Michigan | 70%
|
| 1982 | Pennsylvania | 50%
|
| 1985 | Newfoundland and Labrador | 40%
|
| 1983 | New Mexico | 30%
|