Rank	Countries/Territories	Count	Percent
1	United States	237	39.6%
2	China	153	25.5%
3	Germany	92	15.4%
4	Canada	25	4.2%
5	France	16	2.7%
6	Norway	10	1.7%
7	Singapore	8	1.3%
8	Poland	7	1.2%
9	Russia	6	1%
10	Japan	4	0.7%
11	Korea, Republic of	4	0.7%
12	Latvia	4	0.7%
13	India	3	0.5%
14	Switzerland	3	0.5%
15	United Kingdom	3	0.5%
16	Ukraine	2	0.3%
17	Sweden	2	0.3%
18	Romania	2	0.3%
19	Peru	2	0.3%
20	Netherlands	2	0.3%
21	Iran, Islamic Republic of	2	0.3%
22	Ireland	2	0.3%
23	Italy	1	0.2%
24	Malaysia	1	0.2%
25	Australia	1	0.2%
26	Greece	1	0.2%
27	Hong Kong	1	0.2%
28	Cuba	1	0.2%
29	Cyprus	1	0.2%
30	Czech Republic	1	0.2%
31	Egypt	1	0.2%
32	Spain	1	0.2%