Monaco
17 December 1962
Mongolia
12 February 1992
Montenegro
12 October 1992 (was approved by the Assembly)
Montserrat
effective 19 December 1989
Morocco
10 March 1972; revised 4 September 1992, amended (to create
bicameral legislature) September 1996
Mozambique
30 November 1990
Namibia
ratified 9 February 1990, effective 12 March 1990
Nauru
29 January 1968; amended 17 May 1968 (Constitution Day)
Nepal
9 November 1990
Netherlands
adopted 1815; amended many times, most recently in 2002