Quite a list! At least one important omission. You've left off Ireland (proclaimed 1916, declared 1919, treaty 1921 - so I suppose 1921 is the date to give).
Ireland! Also there are some more marginal cases similar in some ways to Yemen - British Somaliland, British Cameroons, Newfoundland - where independence involved joining either already independent units or union with another decolonising power's holding in the area.