In 1860, Maori acquired 23.2 million acres (80%) of land in the North Island.
Maori obtained 11.6 million acres (40%) of North Island in 1890.
In 1910, Maori acquired 27% of North Island (7.7 million acres).
Maori acquired 9% of North Island (2.8 million acres) in 1939.
In 2000 Maori obtained 4% of North Island.
The decrements of land acquired by Maori was caused by various factors.The New Zealand Settlements Act of 1863 enabled confiscation of land possessed by Maori who fought in the New Zealand wars for European settlement.The Native Land Court separated land into a maximum of ten sections with complete ownership assigned to ten individuals from an iwi.Some Maori were deceived into debt which could be rid of by selling the land possessed.Court processes were expensive (fees and payments for lawyers, surveyors, interpreters, hoteliers, and so forth) and frequently extended for months which Maori could merely attend by selling their land.Over the 20th century land was seized by the Crown and government for public works. (Some land was gifted but not returned once it's objective had been attained).