protectorate (1892-) 1892 1896 NZ control (1901-) 1933 free association (1965-) 1966 1978 UK special mail 1971 Aitutaki 1903 1927 Cook Islands (1973-) 1974 Penrhyn 1902 1920 Cook Islands (1973-) 1993 Rarotonga 1919 1931 2016