http://www.logistics.or.jp/jils_news/%E3%83%AD%E3%82%B8%E3%82%B9%E3%83%86%E3%82%A3%E3%82%AF%E3%82%B9KPI%E6%B4%BB%E7%94%A8%E3%81%AE%E6%89%8B%E5%BC%95%E3%81%8D.pdf