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| 2008 | 2012 | 2016 | 2019 |
| First gradient | Shanghai, Suzhou, Hangzhou, Shaoxing, Ningbo | Shanghai, Suzhou, Wuxi, Hangzhou, Ningbo | Shanghai, Suzhou, Hangzhou, Ningbo, Nanjing | Shanghai, Suzhou, Hangzhou, Ningbo, Nanjing |
| Second gradient | Wuxi, Nanjing, Wenzhou, Jinhua, Taizhou | Nanjing, Changzhou, Nantong, Jinhua, Wenzhou | Nantong, Wuxi, Shaoxing, Wenzhou, Taizhou | Hefei, Wuxi, Jinhua, Taizhou, Wenzhou |
| Third gradient | Nantong, Taizhou, Yangzhou, Zhenjiang, Changzhou, Huzhou, Jiaxing | Shaoxing, Taizhou, Huzhou, Wuhu, Hefei, Yangzhou, Zhenjiang | Yangzhou, Changzhou, Hefei, Huzhou, Jinhua, Zhenjiang, | Yancheng, Nantong, Yangzhou, Changzhou, Huzhou, Shaoxing |
| Fourth gradient | Yancheng, Hefei, Ma’anshan, Wuhu, Anqing | Jiaxing, Ma’anshan, Chuzhou, Taizhou, Yancheng | Yancheng, Taizhou, Ma’anshan, Jiaxing, Wuhu | Chuzhou, Wuhu, Taizhou, Zhenjiang, Jiaxing |
| Fifth gradient | Chuzhou, Tongling, Chizhou, Xuancheng, Zhoushan | Anqing, Chizhou, Xuancheng, Tongling, Zhoushan | Chuzhou, Xuancheng, Tongling, Chizhou, Zhoushan, Anqing | Ma’anshan, Tongling, Xuancheng, Chizhou, Zhoushan, Anqing |