question: The Pew Research Center estimated Protestants to be what percentage of Europe 's Christian population in 2010 ?
answer: 17.8 %
turker_answer: The Pew Research Center estimated Protestants to be 17.8 % of Europe 's Christian population in 2010 .
rule-based: The Pew Research Center estimated Protestants to be 17.8 % Europe 's Christian population in 2010 .