請高手解答:RD 2003/2004/2005的I-485老case在批前多收到RFE

據以下網站數據,RD 2003/2004/2005的I-485老case在批前多收到RFE,而2006/2007的則少有RFE,什莫原因?

http://www.immigrationwatch.com/

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