1930-12-01 1931-10-15 1932-11-01 1933-11-01 1934-11-01 1935-11-01 1936-11-01 1937-11-01 1938-11-01 1939-11-01 1940-07-01 1941-10-15 1943-10-15 1946-10-01 1963-12-15 1964-10-15 1965-10-15 1966-10-15 1967-10-01 1968-10-06 1969-10-05 1974-01-23 1988-12-01 1989-10-15 1990-10-21 1991-10-20 1992-10-18 1999-10-03 2007-12-30 2008-10-19 