Rank	Countries/Territories	Count	Percent
1	United States	479	43.5%
2	China	314	28.5%
3	Germany	135	12.3%
4	Canada	22	2%
5	Japan	16	1.5%
6	Singapore	15	1.4%
7	Hong Kong	15	1.4%
8	Taiwan	14	1.3%
9	Korea, Republic of	11	1%
10	United Kingdom	10	0.9%
11	Netherlands	9	0.8%
12	France	7	0.6%
13	Australia	7	0.6%
14	Iran, Islamic Republic of	6	0.5%
15	Ireland	5	0.5%
16	India	4	0.4%
17	Norway	4	0.4%
18	Switzerland	3	0.3%
19	Czech Republic	3	0.3%
20	Cyprus	2	0.2%
21	Belgium	2	0.2%
22	Italy	2	0.2%
23	Ghana	2	0.2%
24	Moldova, Republic of	2	0.2%
25	Russia	2	0.2%
26	Spain	1	0.1%
27	Sweden	1	0.1%
28	New Zealand	1	0.1%
29	Nigeria	1	0.1%
30	Malaysia	1	0.1%
31	Ukraine	1	0.1%
32	Argentina	1	0.1%
33	Austria	1	0.1%
34	Egypt	1	0.1%