Rank	Countries/Territories	Count	Percent
1	United States	427	34.1%
2	China	290	23.2%
3	Bulgaria	174	13.9%
4	Japan	94	7.5%
5	Germany	61	4.9%
6	Korea, Republic of	48	3.8%
7	France	24	1.9%
8	Singapore	24	1.9%
9	Netherlands	16	1.3%
10	Taiwan	16	1.3%
11	Ukraine	13	1%
12	India	9	0.7%
13	Indonesia	8	0.6%
14	Hong Kong	8	0.6%
15	Australia	5	0.4%
16	Argentina	4	0.3%
17	Cyprus	4	0.3%
18	Turkey	4	0.3%
19	Ireland	4	0.3%
20	Canada	3	0.2%
21	Iran, Islamic Republic of	2	0.2%
22	Malaysia	2	0.2%
23	Spain	2	0.2%
24	Portugal	2	0.2%
25	Russia	2	0.2%
26	Israel	1	0.1%
27	Norway	1	0.1%
28	Poland	1	0.1%
29	Mongolia	1	0.1%
30	Czech Republic	1	0.1%
31	Georgia	1	0.1%