question: According to 2015 data , how many how many visitors gave London its ranking as the number one visited city in the world ?
answer: 65 million
turker_answer: According to 2015 data , 65 million visitors gave London its ranking as the number one most visited city in the world .
rule-based: According to 2015 data , 65 million gave London its ranking as the number one visited city in the world .