question: How much did the pool of money invested worldwide in fixed income investments grow in size from 2000 to 2007 ?
answer: roughly doubled in size
turker_answer: The pool of money invested worldwide in fixed income investments doubled in size in size from 2000 to 2007 .
rule-based: The pool of money invested worldwide in fixed income investments grew roughly doubled in size in size from 2000 to 2007 .