Rank	Countries/Territories	Count	Percent
1	United States	558	49.8%
2	China	215	19.2%
3	Germany	142	12.7%
4	Japan	30	2.7%
5	Canada	26	2.3%
6	Sweden	25	2.2%
7	France	15	1.3%
8	India	12	1.1%
9	Netherlands	12	1.1%
10	United Kingdom	10	0.9%
11	Ireland	8	0.7%
12	Australia	8	0.7%
13	Korea, Republic of	6	0.5%
14	Russia	6	0.5%
15	Hong Kong	5	0.4%
16	Cyprus	4	0.4%
17	Singapore	4	0.4%
18	Poland	4	0.4%
19	Slovakia	3	0.3%
20	Bulgaria	3	0.3%
21	Egypt	2	0.2%
22	Latvia	2	0.2%
23	Norway	2	0.2%
24	Yemen	2	0.2%
25	Philippines	2	0.2%
26	Turkey	2	0.2%
27	Qatar	1	0.1%
28	Switzerland	1	0.1%
29	Thailand	1	0.1%
30	Palestine, State of	1	0.1%
31	Jordan	1	0.1%
32	Slovenia	1	0.1%
33	South Africa	1	0.1%
34	Lithuania	1	0.1%
35	Mexico	1	0.1%
36	Morocco	1	0.1%
37	Italy	1	0.1%
38	Iran, Islamic Republic of	1	0.1%