Sabah and Sarawak still retains a relatively higher degree of autonomy compared to the peninsular states in areas such as immigration, some control over state revenue and legislative power over land and local government. Singapore was a Malaysian state from the formation of Malaysia on 16 September 1963 until it was expelled from the Federation on 9 August 1965. During its time as a state of Malaysia, Singapore had autonomy in the areas of education and labour. Brunei was invited to join the Federation but decided not to at the end due to several issues, such as the status of the Sultan within Malaysia, division of Bruneian oil royalties, and pressure from opposition groups which amounted to the Brunei Revolt. Administrative divisions: