question: What was the estimated value of CDO issuance at it 's peak in Q1 2007 ?
answer: over $ 180 billion
turker_answer: The estimated value of CDO issuance at it 's peak in Q ! 2007 was over $ 180 billion .
rule-based: The estimated value of CDO issuance at it 's peak in Q1 2007 was over $ 180 billion .