1 July 1997

7.2p

6.0p

5.2p

13 February 1998

14.2p

11.9p

10.4p

14 August 1998

7.6p

6.3p

5.5p

12 February 1999

15.8p

13.2p

11.4p

13 August 1999

8.8p

7.4p

6.4p

11 February 2000

18.7p

15.6p

13.6p

11 August 2000

10.1p

8.4p

7.3p

23 February 2001

21.6p

18.0p

15.6p

10 August 2001

10.8p

9.0p

7.8p

22 February 2002

23.7p

19.8p

17.2p

9 August 2002

12.0p

10.0p

8.7p

21 February 2003

23.0p

N/A

20.0p

8 August 2003

12.0p

N/A

10.4p

20 February 2004

30.0p

N/A

26.1p

6 August 2004

15.0p

N/A

13.0p

18 February 2005

35.0p

N/A

30.4p

5 August 2005

16.5p

N/A

14.3p

17 February 2006

39.5p

N/A

34.4p

4 August 2006

18.5p

N/A

16.1p

16 February 2007

43.5p

N/A

37.8p

10 August 2007

21.0p

N/A

18.2p

15 February 2008

48.5p

N/A

42.2p

8 August 2008

24.0p

N/A

20.9p

20 February 2009

42.2p

N/A

N/A

19 August 2009

21.0p

N/A

N/A

19 February 2010

52.0p

N/A

N/A

20 August 2010

24.3p

N/A

N/A

18 February 2011

60.0p

N/A

N/A

19 August 2011

28.1p

N/A

N/A

17 February 2012

67.0p

N/A

N/A

17 August 2012

31.7p

N/A

N/A

18 February 2013

73.9p

N/A

N/A

16 August 2013

35.2p

N/A

N/A

17 February 2014

81.2p

N/A

N/A

19 August 2014

38.8p

N/A

N/A

15 February 2015

89.3p

N/A

N/A

30 June 2015

21.4p

N/A

N/A

30 September 2015

21.4p

N/A

N/A

31 December 2015

49.1p

N/A

N/A

31 March 2016

49.1p

N/A

N/A

30 June 2016

23.5p

N/A

N/A

30 September 2016

23.5p

N/A

N/A

30 December 2016 

54.1p 

N/A 

N/A 

31 March 2017

54.1p

N/A

N/A

30 June 2017

25.85p

N/A

N/A

29 September 2017

25.85p

N/A

N/A

29 December 2017

59.51p

N/A

N/A

29 March 2018

59.51p

N/A

N/A

29 June 2018

28.435p

N/A

N/A

28 September 2018

28.435p

N/A

N/A

31 December 2018

65.46p

N/A

N/A

29 March 2019

65.46p

N/A

N/A

28 June 2019

31.28p

N/A

N/A

30 September 2019

31.28p

N/A

N/A

31 December 2019

72.0p

N/A

N/A

31 March 2020

72.01p

N/A

N/A

30 June 2020

20.85p

N/A

N/A

30 September 2020

20.85p

N/A

N/A

31 December 2020

48.0p

N/A

N/A

31 March 2021

48.01p

N/A

N/A

30 June 2021

21.06p

N/A

N/A

30 September 2021

21.06p

N/A

N/A

31 December 2021

48.48p

N/A

N/A

31 March 2022

48.48p

N/A

N/A

30 June 2022

21.27p

N/A

N/A

30 September 2022

21.27p

N/A

N/A

30 December 2022

49.31p

N/A

N/A