Period

Date on which
period commenced

Date on which
period ended

Interest rate
(% per annum)

1 January 1946

1 August 1952

3.875

2 August 1952

31 March 1956

4.5

1 April 1956

28 February 1961

5.0

1 March 1961

10 April 1963

5.25

11 April 1963

31 March 1965

4.75

1 April 1965

31 July 1968

5.0

1 August 1968

31 March 1970

5.5

1 April 1970

30 September 1973

6.25

1 October 1973

13 September 1974

7.25

14 September 1974

28 February 1978

9.25

1 March 1978

31 March 1980

8.75

1 April 1980

31 July 1980

9.25

1 August 1980

31 December 1980

9.75

1 January 1981

31 August 1981

10.75

1 September 1981

31 March 1982

11.75

1 April 1982

31 January 1983

12.75

1 February 1983

30 September 1983

12.50

1 October 1983

30 November 1983

12.00

1 December 1983

15 April 1985

11.50

16 April 1985

14 July 1985

12.00

15 July 1985

30 September 1985

12.50

1 October 1985

2 April 1986

13.50