Rank	Countries/Territories	Count	Percent
1	United States	511	38.9%
2	China	282	21.5%
3	Germany	169	12.9%
4	Japan	58	4.4%
5	Korea, Republic of	56	4.3%
6	Spain	37	2.8%
7	Singapore	20	1.5%
8	Canada	19	1.4%
9	Switzerland	16	1.2%
10	Netherlands	15	1.1%
11	Sweden	14	1.1%
12	France	14	1.1%
13	India	9	0.7%
14	Australia	9	0.7%
15	Romania	9	0.7%
16	United Kingdom	9	0.7%
17	Russia	7	0.5%
18	Brazil	7	0.5%
19	Viet Nam	6	0.5%
20	Iran, Islamic Republic of	5	0.4%
21	Cyprus	4	0.3%
22	Pakistan	4	0.3%
23	Mexico	4	0.3%
24	Denmark	3	0.2%
25	Egypt	3	0.2%
26	Ireland	3	0.2%
27	Italy	3	0.2%
28	Israel	2	0.2%
29	Indonesia	2	0.2%
30	Bulgaria	2	0.2%
31	Argentina	2	0.2%
32	Mongolia	2	0.2%
33	Philippines	2	0.2%
34	Turkey	2	0.2%
35	Ukraine	1	0.1%
36	Serbia	1	0.1%
37	Portugal	1	0.1%
38	Hong Kong	1	0.1%