question: What percent of the Aboriginal population of North America was killed in the first hundred years after first contact by smallpox and measles ?
answer: between 50 and 67 per cent
turker_answer: Between 50 and 67 per cent of the Aboriginal population of North America was killed in the first hundred years after the first contact of smallpox and measles .
rule-based: Between 50 and 67 per cent was killed in the first hundred years after first contact by smallpox and measles .