2018 | 总访问次数
排名 | 国家/地区 | 数量 | 占比 |
1 | United States | 20 | 36.4% |
2 | Germany | 13 | 23.6% |
3 | China | 11 | 20% |
4 | Netherlands | 5 | 9.1% |
5 | Republic of Korea | 2 | 3.6% |
6 | Romania | 2 | 3.6% |
7 | Finland | 1 | 1.8% |
8 | Venezuela, Bolivarian Republic of | 1 | 1.8% |