1986-03-01 1982-01-19 1980-06-15 1987-09-25 1981-02-06 1981-02-04 1983-10-26 1983-09-30 1975-04-30 1972-06-01 1986-10-26 1982-04-02 1984-09-10 1986-09-15 1988-09-30 1991-01-01 1989-12-12 1981-05-19 1981-10-13 1982-11-27 1980-03-09 1980-11-23 1979-10-09 1981-05-18 1982-05-02 1979-09-09 1985-03-03