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Oh, now I see!ありがとうございました、undrentideさん!
I just realized that I may have parsed the "original" word wrong. I'll give you the whole sentence and my guess.
日本チェーンストア協会によると、加盟社のレジ袋使用枚数は2002年秋に推定100億枚だったが、2002年度末には10%弱減った。
I'm guessing that 10%弱 is something like "below 10%," and I mistakenly thought that the word was 弱減る. Does that look right?