Rank	Countries/Territories	Count	Percent
1	United States	623	46.6%
2	China	329	24.6%
3	Germany	113	8.4%
4	Bulgaria	53	4%
5	Netherlands	32	2.4%
6	United Kingdom	27	2%
7	Japan	18	1.3%
8	Singapore	17	1.3%
9	Denmark	17	1.3%
10	Korea, Republic of	15	1.1%
11	Nigeria	8	0.6%
12	France	8	0.6%
13	Australia	8	0.6%
14	Iran, Islamic Republic of	6	0.4%
15	Ukraine	6	0.4%
16	South Africa	5	0.4%
17	Canada	5	0.4%
18	India	5	0.4%
19	Brazil	5	0.4%
20	Cyprus	4	0.3%
21	Russia	4	0.3%
22	Hong Kong	3	0.2%
23	Spain	3	0.2%
24	Ireland	3	0.2%
25	New Zealand	3	0.2%
26	Norway	2	0.1%
27	Qatar	2	0.1%
28	Egypt	2	0.1%
29	Belgium	2	0.1%
30	Thailand	2	0.1%
31	Argentina	1	0.1%
32	Bangladesh	1	0.1%
33	Croatia	1	0.1%
34	Romania	1	0.1%
35	Sweden	1	0.1%
36	Malaysia	1	0.1%
37	Israel	1	0.1%
38	Iraq	1	0.1%