Rank	Countries/Territories	Count	Percent
1	United States	539	43.6%
2	China	312	25.2%
3	Germany	109	8.8%
4	Russia	83	6.7%
5	France	34	2.8%
6	Canada	17	1.4%
7	Netherlands	16	1.3%
8	South Africa	14	1.1%
9	Singapore	13	1.1%
10	Japan	11	0.9%
11	Lithuania	10	0.8%
12	Korea, Republic of	8	0.6%
13	Hong Kong	8	0.6%
14	Czech Republic	8	0.6%
15	Cyprus	7	0.6%
16	Iran, Islamic Republic of	6	0.5%
17	Latvia	5	0.4%
18	Malaysia	4	0.3%
19	Argentina	4	0.3%
20	Ukraine	4	0.3%
21	United Kingdom	4	0.3%
22	Spain	3	0.2%
23	Australia	3	0.2%
24	India	3	0.2%
25	Ireland	2	0.2%
26	Mongolia	2	0.2%
27	Bangladesh	2	0.2%
28	Switzerland	2	0.2%
29	Norway	2	0.2%
30	Ethiopia	1	0.1%