Rank	Countries/Territories	Count	Percent
1	United States	447	41.7%
2	China	426	39.8%
3	Germany	49	4.6%
4	Japan	20	1.9%
5	Spain	15	1.4%
6	Russia	13	1.2%
7	Singapore	13	1.2%
8	Netherlands	9	0.8%
9	Canada	8	0.7%
10	Australia	8	0.7%
11	Hong Kong	7	0.7%
12	United Kingdom	6	0.6%
13	France	5	0.5%
14	Iran, Islamic Republic of	5	0.5%
15	South Africa	4	0.4%
16	Mexico	4	0.4%
17	Romania	3	0.3%
18	Ireland	3	0.3%
19	Luxembourg	3	0.3%
20	Argentina	3	0.3%
21	Belgium	2	0.2%
22	Denmark	2	0.2%
23	Indonesia	2	0.2%
24	Portugal	2	0.2%
25	Italy	2	0.2%
26	Taiwan	2	0.2%
27	Thailand	2	0.2%
28	Pakistan	1	0.1%
29	Slovakia	1	0.1%
30	Israel	1	0.1%
31	Brazil	1	0.1%
32	Bulgaria	1	0.1%
33	Cyprus	1	0.1%