| Years | President |
| 1843-45 | |
| 1845-48 | |
| 1848-51 | |
| 1851-54, 1857-61, 1869-73 | |
| 1854-57 | |
| 1861-67 | |
| 1867-69, 1883-87 | |
| 1873-78 | |
| 1878-83 | |
| 1887-89 | |
| 1889-93 | |
| 1893-95 | |
| 1895-1901 | |
| 1901-06 | |
| 1906-11 | |
| | Years | President |
| 1911-18, 1924-27 | |
| 1918-24 | |
| 1927-33 | |
| 1933-39 | |
| 1939-45 | |
| 1945-48 | |
| 1948-54 | |
| 1954-60 | |
| 1960-70 | |
| 1970-94 | |
| 1994-98 | |
| 1998-2000 (Acting) | |
| 2000-2011 | |
| 2012- | |
|