Between 1967 and 1999, Singapore also issued a Restricted Passport with a blue cover mainly for travel to West Malaysia. The Restricted Passport was conceived due to the fact that many Singaporeans would regularly travel to West Malaysia for business and leisure purposes. The Restricted Passport ceased to be issued after 1999 due to a lack of demand and the red Singapore Passport was deemed to the be only valid travel document for overseas travel by Singaporean citizens from 1 January 2000.