????:1??????:????vx

2??????????

3???????

4???????????

5?????????

?????:??6??????????28???,15????????,???????????????135.3??,????5.9%;?????????

????,??????????????15??????????,??????????????????5.7%,???,?????????????9%,?????????????????????????,????????????????15??,??????11.4%,5????12.6%,?????????????????????4???????????3.7?????????????5??????????,?????????????????????????,???????????30%?

????????????????????,????????????????,???????????????4%,?????,????????????,??????????????????????,???

????????????????,????,?????????????15????????????,?????,??3.5?,????,???????????????????????????,??? ???????????:???????