Rank	Countries/Territories	Count	Percent
1	United States	344	37.8%
2	China	149	16.4%
3	Japan	127	13.9%
4	Germany	123	13.5%
5	Singapore	48	5.3%
6	Canada	31	3.4%
7	Slovakia	13	1.4%
8	Netherlands	9	1%
9	Korea, Republic of	9	1%
10	Colombia	8	0.9%
11	Mongolia	6	0.7%
12	Cyprus	5	0.5%
13	France	5	0.5%
14	Australia	4	0.4%
15	Chile	3	0.3%
16	Lithuania	3	0.3%
17	Nigeria	3	0.3%
18	Norway	3	0.3%
19	Saudi Arabia	2	0.2%
20	Viet Nam	2	0.2%
21	Hong Kong	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%