1968-12-06 1970-03-08 1984-03-01 1978-11-01 1972-05-19 1987-01-01 1985-12-22 1981-09-25 1984-05-01 1971-03-05 1972-10-20 1991-04-01 1987-01-02 1974-08-30 1968-12-20 1978-05-07 1970-01-01 1991-09-05 1984-01-01 1986-02-09 1991-01-01 1979-12-21 1988-09-01 1971-01-01 1991-04-27 1989-09-01 1990-03-01 1987-05-07 1987-01-01 1974-05-17 1982-01-01 1989-01-01 1989-01-01 1974-12-20 1972-01-01