Rank	Countries/Territories	Count	Percent
1	United States	446	35.5%
2	China	358	28.5%
3	Germany	97	7.7%
4	Japan	53	4.2%
5	Bulgaria	52	4.1%
6	Russia	32	2.5%
7	Spain	26	2.1%
8	Netherlands	24	1.9%
9	France	24	1.9%
10	Switzerland	18	1.4%
11	Singapore	16	1.3%
12	Canada	15	1.2%
13	United Kingdom	9	0.7%
14	Latvia	7	0.6%
15	Turkey	7	0.6%
16	South Africa	6	0.5%
17	Cyprus	6	0.5%
18	Australia	5	0.4%
19	India	5	0.4%
20	Philippines	5	0.4%
21	Portugal	4	0.3%
22	Iran, Islamic Republic of	4	0.3%
23	Nigeria	4	0.3%
24	Ukraine	3	0.2%
25	Bangladesh	3	0.2%
26	Lithuania	3	0.2%
27	Malaysia	3	0.2%
28	Mauritius	2	0.2%
29	Ghana	2	0.2%
30	Belgium	2	0.2%
31	Bolivia, Plurinational State of	2	0.2%
32	Taiwan	2	0.2%
33	Thailand	2	0.2%
34	Ireland	2	0.2%
35	Poland	2	0.2%
36	Romania	1	0.1%
37	Togo	1	0.1%
38	Brazil	1	0.1%
39	Argentina	1	0.1%
40	Viet Nam	1	0.1%