1981-12-25 1986-12-29 1984-03-11 1991-01-01 1981-05-22 1986-05-25 1989-01-01 1980-01-01 1987-01-01 1986-01-23 1986-01-01 1980-12-31 1980-02-22 1990-01-01 1986-01-01 1987-01-01 1977-01-21 1977-04-01 1978-02-10 1978-01-15 1983-07-01 1978-07-14 1979-04-05 1981-05-08 1980-10-03 1981-06-05 1982-05-23 1981-11-05 1982-12-31 1982-06-26 1990-12-06 1983-12-24 1988-12-17