2021 | 总访问次数
排名 | 国家/地区 | 数量 | 占比 |
1 | China | 19 | 24.4% |
2 | United States | 18 | 23.1% |
3 | Netherlands | 15 | 19.2% |
4 | Canada | 9 | 11.5% |
5 | Germany | 8 | 10.3% |
6 | Russia | 4 | 5.1% |
7 | Iran, Islamic Republic of | 3 | 3.8% |
8 | Czech Republic | 1 | 1.3% |
9 | France | 1 | 1.3% |