Rank	Countries/Territories	Count	Percent
1	United States	287	39.3%
2	China	208	28.5%
3	Germany	108	14.8%
4	Canada	36	4.9%
5	France	21	2.9%
6	Japan	15	2.1%
7	Korea, Republic of	9	1.2%
8	Bulgaria	8	1.1%
9	Singapore	7	1%
10	Netherlands	5	0.7%
11	Poland	4	0.5%
12	Switzerland	3	0.4%
13	Ukraine	2	0.3%
14	United Kingdom	2	0.3%
15	Sweden	2	0.3%
16	Malaysia	2	0.3%
17	Iran, Islamic Republic of	2	0.3%
18	Australia	2	0.3%
19	Greece	2	0.3%
20	Hong Kong	1	0.1%
21	Cyprus	1	0.1%
22	Ireland	1	0.1%
23	Italy	1	0.1%
24	Norway	1	0.1%
25	Spain	1	0.1%