28.3
2016?????361???28.3?????7.8%
45
2020??????????????????????????45
1025????????????????????n??(??)?2020?????????45?
?2016?????361???28.3?????7.8%????????3600???????????^
?????????????n??????????????n???“??”????????ա??????????
?2020?????????????????????????45?“???”??120????2800???60??????100???600????2200????4500?
???????????????????????????????????????????????y???????????????????
???????????????????????????????????????????????????????????????????????50?????3???????
??????(?)?????????????????“?”??????????????????????????????“?+?+?”??????(?)2020????12????
?????????????k2020??100???50????230??300????“??”?????????????????????????????????????????5??1?????????( )