Rank	Countries/Territories	Count	Percent
1	United States	210	31.8%
2	China	143	21.7%
3	Bulgaria	73	11.1%
4	Germany	24	3.6%
5	United Kingdom	23	3.5%
6	France	18	2.7%
7	Singapore	13	2%
8	Korea, Republic of	12	1.8%
9	Australia	12	1.8%
10	Canada	12	1.8%
11	Japan	11	1.7%
12	Indonesia	10	1.5%
13	India	9	1.4%
14	Czech Republic	9	1.4%
15	Netherlands	9	1.4%
16	Spain	9	1.4%
17	Greece	8	1.2%
18	Bangladesh	6	0.9%
19	Brazil	5	0.8%
20	Hong Kong	5	0.8%
21	Cyprus	4	0.6%
22	Slovenia	4	0.6%
23	Israel	4	0.6%
24	Pakistan	3	0.5%
25	Romania	3	0.5%
26	Russia	2	0.3%
27	Sweden	2	0.3%
28	Switzerland	2	0.3%
29	Taiwan	2	0.3%
30	Poland	2	0.3%
31	Norway	2	0.3%
32	Mexico	2	0.3%
33	Cambodia	2	0.3%
34	Hungary	1	0.2%
35	Iceland	1	0.2%
36	Iran, Islamic Republic of	1	0.2%
37	Portugal	1	0.2%
38	Viet Nam	1	0.2%