????:1???????????:???????????

2??????????

3?????kb??

4???92?????

5???????

????9??????20?????????? (????? ????)???????????20??????????,??????8???,?????????????????????????????????????,???11.2??,??12.6?????????????????

???????,??,???????????????????,???????

??,???????????????8??,????11.0%,?????????1.2???????????????????????????????????,??????1.2?????????????????,?9.1???

??,???1??????8??????????????,?????????6.8%??,?????????????????????,????????????????7.3%,????4.1%?(???????) ????????????????:??