| Years | Prime minister/head of government | Political Party |
| 1848-1848 | |
| 1848-1849 | |
| 1849-1853 | |
| 1853-1856 | |
| 1856-1858 | |
| 1858-1860 | |
| 1860-1861 | |
| 1861-1861 | |
| 1861-1862 | |
| 1862-1866 | |
| 1866-1866 | |
| 1866-1868 | |
| 1868-1871 | |
| 1871-1872 | |
| 1872-1874 | |
| 1874-1877 | |
| 1877-1879 | |
| 1879-1883 | |
| 1883-1888 | |
| 1888-1891 | |
| 1891-1894 | |
| 1894-1897 | |
| 1897-1901 | |
| 1901-1905 | |
| 1905-1908 | |
| | Years | Prime minister/head of government | Political Party |
| 1908-1913 | |
| 1913-1918 | |
| 1918-1925 | |
| 1925-1926 | |
| 1926-1929 | |
| 1929-1933 | |
| 1933-1939 | |
| 1939-1940 | |
| 1940-1945 | |
| 1945-1946 | |
| 1946-1948 | |
| 1948-1958 | |
| 1958-1959 | |
| 1959-1963 | |
| 1963-1965 | |
| 1965-1966 | |
| 1966-1967 | |
| 1967-1971 | |
| 1971-1973 | |
| 1973-1977 | |
| 1977-1982 | |
| 1982-1994 | |
| 1994-2002 | |
| 2002-2010 | |
| 2010-Incumbent | |
|