Rank	Countries/Territories	Count	Percent
1	United States	559	33.5%
2	China	536	32.1%
3	Germany	354	21.2%
4	Japan	66	4%
5	Korea, Republic of	36	2.2%
6	Canada	17	1%
7	Bulgaria	16	1%
8	Singapore	16	1%
9	France	11	0.7%
10	Malaysia	5	0.3%
11	Netherlands	5	0.3%
12	Indonesia	4	0.2%
13	Colombia	4	0.2%
14	Cyprus	4	0.2%
15	Australia	4	0.2%
16	Cambodia	3	0.2%
17	India	3	0.2%
18	Nigeria	3	0.2%
19	Ukraine	3	0.2%
20	Togo	3	0.2%
21	Morocco	2	0.1%
22	Taiwan	2	0.1%
23	United Kingdom	2	0.1%
24	Hong Kong	2	0.1%
25	Greece	1	0.1%
26	Mongolia	1	0.1%
27	Argentina	1	0.1%
28	Viet Nam	1	0.1%
29	Turkey	1	0.1%
30	Pakistan	1	0.1%
31	Philippines	1	0.1%
32	Iran, Islamic Republic of	1	0.1%
33	South Africa	1	0.1%