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Historical Values
Year Value
1990 ratified 1966, in effect 1967
1991 ratified 1966, in effect 1967
1992 ratified 1966, in effect 1967; note - a comprehensive revision is awaiting ratification by the US Congress (1992)
1993 ratified 1966, in effect 1967
1994 ratified 1966, in effect 1967
1995 ratified 1966, in effect 1967
1996 ratified 1966, in effect 1967
1997 ratified 1966, in effect 1967
1998 ratified 1966, in effect 1967
1999 ratified 1966, in effect 1967
2000 ratified 1966, in effect 1967
2001 ratified 1966, in effect 1967
2002 ratified 1966, in effect 1967
2003 ratified 1966, in effect 1967
2004 ratified 1966, in effect 1967
2005 ratified 2 June 1966, effective 1 July 1967
2006 ratified 2 June 1966, effective 1 July 1967
2007 ratified 2 June 1966, effective 1 July 1967
2008 ratified 2 June 1966, effective 1 July 1967
2009 ratified 2 June 1966; effective 1 July 1967
2010 ratified on 2 June 1966; effective 1 July 1967
2011 ratified 2 June 1966; effective 1 July 1967
2012 ratified 2 June 1966; effective 1 July 1967
2013 ratified 2 June 1966, effective 1 July 1967 (2013)
2014 ratified 2 June 1966, effective 1 July 1967 (2013)
2015 adopted 17 October 1960; revised 1 July 1967; amended 1971, 1977, 1979 (2015)
2016 adopted 17 October 1960; revised 1 July 1967; amended several times, last in 2013 (2016)
2017 adopted 17 October 1960; revised 1 July 1967; amended several times, last in 2013 (2016)
2018 history: adopted 17 October 1960; revised 1 July 1967 (2017) | amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval in a referendum, and approval by the US Secretary of the Interior; amended 1971, 1977, 1979 (2017)
2019 history: adopted 17 October 1960; revised 1 July 1967 | amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval in a referendum, and approval by the US Secretary of the Interior; amended 1971, 1977, 1979 (2017)
2020 history: adopted 17 October 1960; revised 1 July 1967 | amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval in a referendum, and approval by the US Secretary of the Interior; amended 1971, 1977, 1979
2021 history: adopted 17 October 1960; revised 1 July 1967 amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval in a referendum, approval by the US Secretary of the Interior, and only by an act of the US Congress; amended several times, last in 2021
2022 history: adopted 17 October 1960; revised 1 July 1967 amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval by simple majority vote in a referendum, approval by the US Secretary of the Interior, and only by an act of the US Congress; amended several times, last in 2021
2023 history: adopted 17 October 1960; revised 1 July 1967 amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval by simple majority vote in a referendum, approval by the US Secretary of the Interior, and only by an act of the US Congress; amended several times, last in 2021
2024 history: adopted 17 October 1960; revised 1 July 1967 amendments: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval by simple majority vote in a referendum, approval by the US Secretary of the Interior, and only by an act of the US Congress; amended several times, last in 2021
2025 history: adopted 17 October 1960; revised 1 July 1967 amendment process: proposed by either house of the Legislative Assembly; passage requires three-fifths majority vote by the membership of each house, approval by simple majority vote in a referendum, approval by the US Secretary of the Interior, and only by an act of the US Congress