| 1. | 26 January 1950 — 6 November 1951 |
| 2. | 7 November 1951 — 3 January 1954 |
| 3. | 4 January 1954 — 22 December 1954 |
| 4. | 23 December 1954 — 31 January 1956 |
| 5. | 1 February 1956 — 30 September 1959 |
| 6. | 1 October 1959 — 31 January 1964 |
| 7. | 1 February 1964 — 15 March 1966 |
| 8. | 16 March 1966 — 29 June 1966 |
| 9. | 30 June 1966 — 11 April 1967 |
| 10. | 12 April 1967 — 24 February 1968 |
| 11. | 25 February 1968 — 16 December 1970 |
| 12. | 17 December 1970 — 21 January 1971 |
| 13. | 22 January 1971 — 25 April 1973 |
| 14. | 26 April 1973 — 27 January 1977 |
| 15. | 28 January 1977 — 21 February 1978 |
| 16. | 22 February 1978 — 11 July 1985 |
| 17. | 12 July 1985 — 20 December 1986 |
| 18. | 21 December 1986 — 18 June 1989 |
| 19. | 19 June 1989 — 17 December 1989 |
| 20. | 18 December 1989 — 25 September 1990 |
| 21. | 26 September 1990 — 24 November 1991 |
| 22. | 25 November 1991 — 12 December 1991 |
| 23. | 13 December 1991 — 17 November 1992 |
| 24. | 18 November 1992 — 11 February 1993 |
| 25. | 12 February 1993 — 24 October 1994 |
| 26. | 25 October 1994 — 24 March 1997 |
| 27. | 25 March 1997 — 17 January 1998 |
| 28. | 18 January 1998 — 9 October 1998 |
| 29. | 10 October 1998 — 11 January 2001 |
| 30. | 11 January 2001 — 06 May 2002 |
| 31. | 06 May 2002 — 08 November 2002 |
| 32. | 08 November 2002 — 19 December 2002 |
| 33. | 19 December 2002 — 02 May 2004 |
| 34. | 02 May 2004 — 01 June 2004 |
| 35. | 01 June 2004 — 01 November 2005 |
| 36. | 01 November 2005 — 13 January 2007 |
| 37. | 14 January 2007 — 11 May 2010 |
| 38. | 12 May, 2010 — till date |
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