There may be another factor whereby the regular workers have to match old addresses with new ones in many areas where the municipal names have changed due to the so-called "great merger of municipalities in the Heisei era."
また、いわゆる「平成の大合併」で市町村名の変更のあった地域も多いことから新旧住所の対応などに追われることも考えられよう。