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Historical Values
Year Value
1993 1 January 1981
1994 1 January 1981
1995 1 January 1981
1996 1 January 1981
1997 1 January 1981
1998 1 January 1981
1999 1 January 1981
2000 1 January 1981
2001 1 January 1981
2002 1 January 1981
2003 1 January 1981
2004 1 January 1981
2005 1 January 1981
2006 1 January 1981
2007 1 January 1981
2008 1 January 1981
2009 1 January 1981
2010 1 January 1981
2011 1 January 1981
2012 1 January 1981
2013 ratified 9 July 1980, effective 1 January 1981; amended 1992, 2004 (2011)
2014 ratified 9 July 1980, effective 1 January 1981; amended 1992, 2004 (2011)
2015 ratified 9 July 1980, effective 1 January 1981; amended 1992, 2004, last in 2008 (2015)
2016 ratified 9 July 1980, effective 1 January 1981; amended 1992, 2004, 2008 (2016)
2017 ratified 9 July 1980, effective 1 January 1981; amended 1992, 2004, 2008 (2016)
2018 history: ratified 9 July 1980, effective 1 January 1981 (2017) | amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25 percent of eligible voters, or by a resolution adopted by at least three-fourths of National Congress members; passage requires approval by a majority of votes in at least three-fourths of the states in the next regular general election; amended 1992, 2004, 2008 (2017)
2019 history: ratified 9 July 1980, effective 1 January 1981 | amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election; amended 1992, 2004, 2008 (2017)
2020 history: ratified 9 July 1980, effective 1 January 1981 | amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election; amended 1992, 2004, 2008
2021 history: ratified 9 July 1980, effective 1 January 1981 amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election; amended several times, last in 2020
2022 history: ratified 9 July 1980, effective 1 January 1981 amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election; amended several times, last in 2020
2023 history: ratified 9 July 1980, effective 1 January 1981 amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election; amended several times, last in 2020
2024 history: ratified 9 July 1980, effective 1 January 1981 amendments: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election; amended several times, last in 2020
2025 history: ratified 9 July 1980, effective 1 January 1981 amendment process: proposed by a constitutional convention (held at least once every 15 years with voter approval), by public petition of at least 25% of eligible voters, or by a resolution adopted by at least three fourths of National Congress members; passage requires approval by a majority of votes in at least three fourths of the states in the next regular general election