| | Level | 2000 | 2010 | 2020 |
| | The first | Jinan (1) | Jinan (1) | Jinane, Zhengzhou, Taiyuan, Xi’an (4) | | The second | Taiyuan (1) | Weifang, Taian, Zhengzhou, Taiyuan, Xi’an, Lanzhou (6) | Jining, Weifang, Lanzhou (3) | | The third | Zhengzhou, Huhehot (2) | Dongying, Zibo, Jining, Liaocheng, Jiaozuo, Linfen, Huhehot, Xining (8) | Zibo, Taian, Liaocheng, Huhehot, Yinchuan, Xining (6) | | The fourth | Xi’an, Yinchuan, Lanzhou (3) | Heze, Shangluo, Shangqiu, Xinxiang, Jincheng, etc. (21) | Dongying, Binzhou, Heze, Shangqiu, Luoyang, Yuncheng, etc. (12) | | The fifth | Weifang, Zibo, Luoyang, Baiyin, etc. (58) | Binzhoui, Kaifeng, Luoyang, Shuozhou, Yulin, etc. (29) | Puyang, Kaifeng, Xinxiang, Yulin, Guyuan, Dingxi, Haidong, etc. (40) |
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