The statistics on Tongans and Samoans are highly distorted. Most casual sources (such as the one you've quoted, judging by the number you gave and the fact you said it was the population of Tonga) is not accurate, especially when the "Maori," and "Native Hawaiian" are based on claimed ancestry and geographical place of residence. There are more ethnic Tongans, who fully recognize themselves as such, and maintain significant cultural and (in may cases) linguistic integrity, but who permanently in New Zealand, the Cook Islands, Niue, Tokelau, and Fiji, collectively, than in Tonga itself, and, likewise, the Samoans between the American Samoa and the sovereign and independent Samoa together is significantly less than ethnic Samoans living in New Zealand, the Cook Islands, Niue, Tokelau, Hawaii, Guam, the United States (in fact, ethnic Samoans are the most disproportionately represented ethnic group in the world, compared to their tiny global population, for playing all three of Association, Rubgy, and Gridiron Football at the professional level, even though no professional team, field, or stadium for any of the three types of football exist on the actual islands of Samoa). So, if you included Samoans and Tongans by total heritage, wherever they may live (like you did with Hawaiians and Maoris), and not just those who actually live in Tonga or Samoa (which is what you did), their numbers are actually much closer.