1977-09-10 1983-10-18 1981-06-07 1982-10-12 1983-05-03 1985-11-12 1987-01-01 1986-01-01 1982-10-04 1986-08-23 1989-01-01 1988-01-01 1987-01-01 1990-09-04 1987-07-12 1981-10-05 1981-01-01 1982-01-01 1989-01-01 1989-01-01 1989-01-01 1988-01-01 2001-08-01 1992-12-01