Rank	Countries/Territories	Count	Percent
1	United States	811	49.7%
2	China	201	12.3%
3	Germany	152	9.3%
4	Bulgaria	88	5.4%
5	Canada	77	4.7%
6	Netherlands	58	3.6%
7	India	29	1.8%
8	France	25	1.5%
9	United Kingdom	23	1.4%
10	Korea, Republic of	19	1.2%
11	Japan	16	1%
12	South Africa	11	0.7%
13	Morocco	10	0.6%
14	Nigeria	9	0.6%
15	Slovakia	9	0.6%
16	Mauritius	9	0.6%
17	Turkey	8	0.5%
18	Spain	7	0.4%
19	Cyprus	7	0.4%
20	Kenya	6	0.4%
21	Philippines	6	0.4%
22	Singapore	5	0.3%
23	Romania	5	0.3%
24	Uganda	5	0.3%
25	Bangladesh	5	0.3%
26	Iran, Islamic Republic of	4	0.2%
27	Ireland	4	0.2%
28	Thailand	4	0.2%
29	Australia	3	0.2%
30	Ghana	3	0.2%
31	Switzerland	2	0.1%
32	Senegal	2	0.1%
33	Viet Nam	2	0.1%
34	Poland	1	0.1%
35	Norway	1	0.1%
36	Taiwan	1	0.1%
37	Ukraine	1	0.1%
38	Hong Kong	1	0.1%
39	Latvia	1	0.1%
40	Lithuania	1	0.1%