Rank	Countries/Territories	Count	Percent
1	United States	461	35.1%
2	China	301	22.9%
3	Bulgaria	174	13.2%
4	Japan	96	7.3%
5	Germany	62	4.7%
6	Korea, Republic of	54	4.1%
7	France	27	2.1%
8	Singapore	25	1.9%
9	Netherlands	17	1.3%
10	Taiwan	16	1.2%
11	Ukraine	13	1%
12	India	9	0.7%
13	Indonesia	8	0.6%
14	Hong Kong	8	0.6%
15	Argentina	5	0.4%
16	Australia	5	0.4%
17	Canada	4	0.3%
18	Cyprus	4	0.3%
19	Turkey	4	0.3%
20	Ireland	4	0.3%
21	Spain	3	0.2%
22	Russia	3	0.2%
23	Portugal	2	0.2%
24	Iran, Islamic Republic of	2	0.2%
25	Malaysia	2	0.2%
26	Mongolia	1	0.1%
27	Czech Republic	1	0.1%
28	Georgia	1	0.1%
29	Israel	1	0.1%
30	Norway	1	0.1%
31	Poland	1	0.1%