| 1801 cyfethol | 1802 | 1806 | 1807 | 1812 | 1818 | 1820 | 1826 | 1830 | 1831 | 1832 | 1835 | 1837 | 1841 | 1847 | 1852 | 1857 | 1859 | 1865 | 1868 | 1874 | 1880 | 1885 | 1886 | 1892 | 1895 | 1900 | 1906 | 1910 (Ion) | 1910 (Rhag) | 1918 | 1922 | 1923 | 1924 | 1929 | 1931 | 1935 | 1945 | 1950 | 1951 | 1955 | 1959 | 1964 | 1966 | 1970 | 1974 (Chwe) | 1974 (Hyd) | 1979 | 1983 | 1987 | 1992 | 1997 | 2001 | 2005 | 2010 | 2015 | 2017
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