??????? 3???? ??? ??? ??? 1?? ???? ‘?? ??? (Step-Up) ??’? ????. ‘??? ??’? ????? ???? ?? ????? ?? 3???? ??? ???? ??? ??? ??. 12??? 3??? ? ???? ?? ???? ??? ?? ????. ? ??? ??? ‘? 2.8%→3.0% →3.4%→5.6%’(??·3? 26? ??)? ??? ??? ?? ???? ??? ? 3??? ??? ??? ???? ??? ?? ????.
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