1. Announced on November 24, 1970
2. Amended on June 26 1972.
3. Amended on January 20 1973.
4. Amended on May 11973.
5. Amended on December 17 1974.
6. Amended on April 19 1976.
7. Amended on August 28 1978.
8. Amended on February 27 1979.
9. Amended on May 29 1980.
10. Amended on September 8 1983.
11. Amended on July 29 1985.
12. Amended on March 17 1986.
13. Amended on June 29 1986
14. Amended on August 17 1992.
15. Amended on May 3 1999.
16. Amended on June 18, 2002.
17. Amended on March 24, 2005.
18. Amended on February 12, 2010.
19. Amended on August 06, 2010.
20. Amended on March 18, 2015.
21. Amended on April 07, 2017,
22. Amended on December 28, 2017
23. Amended on August 31,2018
24. Amended on May 13,2020
25. Amended on May 18,2020