@ @500 ` 1,000 ~

@ 1,000 ` 2,000 ~

@ 2,001 ` 2,400 ~

@ 2,401 ` 3,000 ~

@ 3,001 ` 3,300 ~

@ 3,301 ` 3,800 ~

@ 3,801 ` 4,000 ~

@ 4,001 ` 5,000 ~

@ 5,001 ` 10,000~

@10,001 ` 20,000~