(????=????,???) ? ??1
?? 10? ? 4?? ??? ?? ???? ????? ?? ????? ???? ???? ??? ‘????’? ??? ????.
13? ????? ???? ?? 5258?? ???? ‘???? ?? ??’? ?? ?? ??? ???, ??? 37.3%? ???? ?????? ???.
??????? ??? ???? Δ20?(41.1%) Δ30?(40.6) Δ40? ??(17.6%)? ????. ?? ??? ???? ??? 41.9%, ??? 17.4%? ?? ???? ?????? ???.
? ????? ??? ??? ????? ‘??? ??’? 1??? ????. ??? ?? ??? ??? ??? ?? Δ??? ?? ??(67.9%) Δ??? ?? ??(18.9%) Δ??? ?? ??(11.3%) Δ??(1.9%) ????.
?
(??=??1)
(??=??1)