Suriname was a constituent country within the Kingdom from 1954 to 1975, while the Netherlands Antilles was a constituent country from 1954 until 2010. Suriname has since become an independent republic, and the Netherlands Antilles was divided into six. Three are constituent countries: Aruba (since 1986), Curaçao and Sint Maarten (since 2010); three are special municipalities of the Netherlands proper: Bonaire, Sint Eustatius and Saba. Netherlands New Guinea was a dependent territory of the Kingdom until 1962, but was not an autonomous country, and was not mentioned in the Charter.