Effective 14 January 2013, Cuba ended the requirement established in 1961, that any citizens who wish to travel abroad were required to obtain an expensive government permit and a letter of invitation. In 1961 the Cuban government had imposed broad restrictions on travel to prevent the mass emigration of people after the 1959 revolution; it approved exit visas only on rare occasions. Requirements were simplified: Cubans need only a passport and a national ID card to leave; and they are allowed to take their young children with them for the first time. However, a passport costs on average five months' salary. Observers expect that Cubans with paying relatives abroad are most likely to be able to take advantage of the new policy. In the first year of the program, over 180,000 left Cuba and returned.