Rank	Countries/Territories	Count	Percent
1	United States	421	40.6%
2	China	159	15.3%
3	Germany	150	14.5%
4	Japan	127	12.3%
5	Singapore	48	4.6%
6	Canada	32	3.1%
7	Slovakia	13	1.3%
8	Mongolia	12	1.2%
9	Netherlands	9	0.9%
10	Korea, Republic of	9	0.9%
11	Colombia	8	0.8%
12	France	6	0.6%
13	Cyprus	5	0.5%
14	Hong Kong	5	0.5%
15	Australia	4	0.4%
16	Chile	3	0.3%
17	Lithuania	3	0.3%
18	Nigeria	3	0.3%
19	Norway	3	0.3%
20	Viet Nam	2	0.2%
21	Saudi Arabia	2	0.2%
22	India	2	0.2%
23	Iran, Islamic Republic of	2	0.2%
24	Ireland	2	0.2%
25	Denmark	2	0.2%
26	Moldova, Republic of	1	0.1%
27	Russia	1	0.1%
28	Spain	1	0.1%
29	United Kingdom	1	0.1%