Year

From

To

1968

18-Sep-1968

17-Mar-1969

1974

3-Jan-1974

6-Mar-1974

1974

28-Mar-1974

2-Jul-1977

1978

12-Nov-1978

16-Jan-1980

1983

24-Jun-1983

16-Mar-1985

1991

4-Mar-1991

3-Jul-1991