Rank	Countries/Territories	Count	Percent
1	United States	526	37.4%
2	China	315	22.4%
3	Bulgaria	174	12.4%
4	Japan	97	6.9%
5	Germany	63	4.5%
6	Korea, Republic of	55	3.9%
7	France	27	1.9%
8	Singapore	26	1.8%
9	Netherlands	17	1.2%
10	Taiwan	16	1.1%
11	Ukraine	14	1%
12	India	9	0.6%
13	Indonesia	8	0.6%
14	Hong Kong	8	0.6%
15	Australia	7	0.5%
16	Argentina	6	0.4%
17	Cyprus	6	0.4%
18	Canada	5	0.4%
19	Turkey	4	0.3%
20	Ireland	4	0.3%
21	Russia	3	0.2%
22	Spain	3	0.2%
23	Malaysia	3	0.2%
24	Iran, Islamic Republic of	2	0.1%
25	Portugal	2	0.1%
26	South Africa	2	0.1%
27	Israel	1	0.1%
28	Norway	1	0.1%
29	Poland	1	0.1%
30	Mongolia	1	0.1%
31	Czech Republic	1	0.1%
32	Georgia	1	0.1%