Sao Tome and Principe
approved March 1990, effective 10 September
1990
Saudi Arabia
governed according to Shari'a law; the Basic Law that
articulates the government's rights and responsibilities was
introduced in 1993
Senegal
new constitution adopted 7 January 2001
Serbia
10 November 2006
Seychelles
18 June 1993
Sierra Leone
1 October 1991; subsequently amended several times
Singapore
3 June 1959; amended 1965 (based on preindependence State
of Singapore Constitution)
Slovakia
ratified 1 September 1992, effective 1 January 1993;
changed in September 1998 to allow direct election of the president;
amended February 2001 to allow Slovakia to apply for NATO and EU
membership
Slovenia
adopted 23 December 1991
Solomon Islands
7 July 1978