?????????????????????:80%??

????:?????200??500:??????vx

????????????9?????????????????????????????25??????????????? ????«????»??????,??????????,80%??,??????“????”,?????

????????????,??????,???18%????,??????????????????“??”???????????????“???”?,?????????

?,??,???,??

???????,?????2016???3????????????????????,??????77%??????80%?2012????????????????69%,2004???????65%?

??,????????2016??3???????????????,??21%??????18%?2012???29%,2004??34%?

?????????????????????????????????,??????,?????19%??????????????????????15%???18%????

????8??1????20????,????1015?????,???4??? ????????:?????