Rank	Countries/Territories	Count	Percent
1	United States	472	45.7%
2	China	264	25.6%
3	Germany	137	13.3%
4	France	20	1.9%
5	Korea, Republic of	11	1.1%
6	Netherlands	11	1.1%
7	Singapore	11	1.1%
8	Switzerland	11	1.1%
9	United Kingdom	10	1%
10	Australia	10	1%
11	Canada	9	0.9%
12	India	8	0.8%
13	Japan	8	0.8%
14	Ireland	6	0.6%
15	Russia	6	0.6%
16	Cyprus	6	0.6%
17	Argentina	3	0.3%
18	Indonesia	3	0.3%
19	Iran, Islamic Republic of	3	0.3%
20	Hong Kong	3	0.3%
21	Tunisia	3	0.3%
22	Ukraine	2	0.2%
23	Romania	2	0.2%
24	Latvia	2	0.2%
25	Malaysia	2	0.2%
26	Mongolia	2	0.2%
27	Austria	2	0.2%
28	Bangladesh	2	0.2%
29	Dominican Republic	2	0.2%
30	Greece	2	0.2%