Rank	Countries/Territories	Count	Percent
1	United States	268	37.9%
2	China	143	20.2%
3	Germany	52	7.3%
4	France	32	4.5%
5	Japan	28	4%
6	Sweden	23	3.2%
7	Iran, Islamic Republic of	21	3%
8	United Kingdom	13	1.8%
9	Russia	12	1.7%
10	Singapore	10	1.4%
11	Netherlands	10	1.4%
12	Kazakhstan	9	1.3%
13	Korea, Republic of	9	1.3%
14	Australia	8	1.1%
15	Canada	7	1%
16	Switzerland	6	0.8%
17	South Africa	5	0.7%
18	Turkey	4	0.6%
19	Belgium	4	0.6%
20		4	0.6%
21	India	4	0.6%
22	Hong Kong	3	0.4%
23	Malaysia	3	0.4%
24	Taiwan	3	0.4%
25	Slovakia	3	0.4%
26	Ireland	3	0.4%
27	Israel	2	0.3%
28	Peru	2	0.3%
29	Philippines	2	0.3%
30	Portugal	2	0.3%
31	Qatar	2	0.3%
32	Sri Lanka	2	0.3%
33	Bangladesh	2	0.3%
34	Colombia	2	0.3%
35	Cyprus	1	0.1%
36	Argentina	1	0.1%
37	Hungary	1	0.1%
38	Norway	1	0.1%
39	Viet Nam	1	0.1%