question: By what percent is Yale committed to reducing greenhouse gas emissions below 1990 levels by the year 2020 ?
answer: 10 %
turker_answer: Yale is committed to reducing greenhouse gas emissions below 1990 levels by 10 % by the year 2020 .
rule-based: Yale is committed to reducing greenhouse gas emissions below 1990 levels by the year 2020 by 10 % .