1. Announced on September 26, 1947; entered into force on January 1, 1949
2. Amended on August 16, 1958
3. Amended on August 22, 1973
4. Amended on October 2, 1981
5. Amended on April 18, 1986
6. Amended on July 10, 1987
7. Amended on October 3, 1994
8. Amended on November 6, 2002
9. Amended on April 7, 2004; effective on July 1, 2004
10. Amended on August 19, 2008
11. Amended on November 16, 2010
12. Amended on November 9, 2012; entered into force on January 1, 2013
13. Amended on November 6, 2014; entered into force on November 8, 2014
14. Amended on March 7, 2016; entered into force on March 9, 2016
15. Amended on June 29, 2016; entered into force on July 1, 2016
16. Amended on April 19, 2017; entered into force on May 1, 2017
17. Amended on September 27, 2019; entered into force on November 1, 2019
18. Amended on June 24, 2020; entered into force on June 26, 2020
19. Amended on Octorber 20, 2022; entered into force on Octorber 22, 2022
20. Amended on March 24, 2023; entered into force on May 1, 2023