Rank	Countries/Territories	Count	Percent
1	United States	428	38.2%
2	China	367	32.8%
3	Germany	125	11.2%
4	Canada	39	3.5%
5	France	34	3%
6	Ireland	30	2.7%
7	Japan	18	1.6%
8	Korea, Republic of	10	0.9%
9	Bulgaria	9	0.8%
10	Singapore	8	0.7%
11	United Kingdom	7	0.6%
12	Netherlands	6	0.5%
13	Argentina	6	0.5%
14	Poland	4	0.4%
15	Norway	3	0.3%
16	Switzerland	3	0.3%
17	Cyprus	3	0.3%
18	Greece	2	0.2%
19	Australia	2	0.2%
20	Bangladesh	2	0.2%
21	Malaysia	2	0.2%
22	Iran, Islamic Republic of	2	0.2%
23	Ukraine	2	0.2%
24	Sweden	2	0.2%
25	Spain	1	0.1%
26	Russia	1	0.1%
27	Italy	1	0.1%
28	Mongolia	1	0.1%
29	Hong Kong	1	0.1%
30	Denmark	1	0.1%