| Year | % Correct |
|---|---|
| 2020 | 96%
|
| 1976 | 93%
|
| 1992 | 89%
|
| 1980 | 85%
|
| 1960 | 81%
|
| 1796 | 74%
|
| 1800 | 74%
|
| 1912 | 74%
|
| 1932 | 74%
|
| 1824 | 70%
|
| 1828 | 70%
|
| 1836 | 70%
|
| 1888 | 70%
|
| 1892 | 70%
|
| 1840 | 67%
|