Rank	Countries/Territories	Count	Percent
1	United States	379	45.9%
2	China	174	21.1%
3	Germany	73	8.8%
4	Bulgaria	53	6.4%
5	United Kingdom	27	3.3%
6	Netherlands	16	1.9%
7	Japan	16	1.9%
8	Singapore	15	1.8%
9	Korea, Republic of	10	1.2%
10	Denmark	8	1%
11	Nigeria	8	1%
12	Brazil	5	0.6%
13	Ukraine	4	0.5%
14	Canada	4	0.5%
15	India	4	0.5%
16	Iran, Islamic Republic of	3	0.4%
17	Ireland	3	0.4%
18	Spain	3	0.4%
19	New Zealand	3	0.4%
20	Norway	2	0.2%
21	Thailand	2	0.2%
22	Hong Kong	2	0.2%
23	Belgium	2	0.2%
24	Egypt	2	0.2%
25	Cyprus	2	0.2%
26	France	1	0.1%
27	Australia	1	0.1%
28	Malaysia	1	0.1%
29	Israel	1	0.1%
30	Sweden	1	0.1%
31	Romania	1	0.1%