Rank	Countries/Territories	Count	Percent
1	United States	268	36.7%
2	China	251	34.4%
3	Germany	57	7.8%
4	France	20	2.7%
5	Japan	18	2.5%
6	Netherlands	17	2.3%
7	Bulgaria	12	1.6%
8	Canada	12	1.6%
9	Korea, Republic of	9	1.2%
10	United Kingdom	8	1.1%
11	Portugal	5	0.7%
12	Thailand	5	0.7%
13	Singapore	5	0.7%
14	Russia	4	0.5%
15	Cyprus	4	0.5%
16	Hong Kong	4	0.5%
17	Latvia	3	0.4%
18	Taiwan	3	0.4%
19	South Africa	3	0.4%
20	Spain	3	0.4%
21	Mexico	3	0.4%
22	Viet Nam	2	0.3%
23	Ukraine	2	0.3%
24	Italy	2	0.3%
25	Iran, Islamic Republic of	2	0.3%
26	Ireland	1	0.1%
27	Australia	1	0.1%
28	Bangladesh	1	0.1%
29	Denmark	1	0.1%
30	Lithuania	1	0.1%
31	Myanmar	1	0.1%
32	Philippines	1	0.1%
33	Switzerland	1	0.1%