Switzerland
revision of Constitution of 1874 approved by the Federal
Parliament 18 December 1998, adopted by referendum 18 April 1999,
officially entered into force 1 January 2000
Syria
13 March 1973
Taiwan
adopted on 25 December 1946; promulgated on 1 January 1947;
effective 25 December 1947; amended numerous times
Tajikistan
6 November 1994
Tanzania
25 April 1977; major revisions October 1984
Thailand
24 August 2007
Timor-Leste
20 May 2002 (effective date)
Togo
adopted by public referendum 27 September 1992
Tokelau
administered under the Tokelau Islands Act of 1948; amended
in 1970
Tonga
4 November 1875; revised 1 January 1967