Rank	Countries/Territories	Count	Percent
1	United States	312	49.2%
2	China	152	24%
3	Germany	63	9.9%
4	Singapore	32	5%
5	Canada	15	2.4%
6	Norway	12	1.9%
7	France	10	1.6%
8	Japan	8	1.3%
9	Netherlands	6	0.9%
10	Cyprus	4	0.6%
11	Australia	3	0.5%
12	India	3	0.5%
13	Ukraine	3	0.5%
14	Bulgaria	2	0.3%
15	Argentina	2	0.3%
16	Egypt	2	0.3%
17	Latvia	1	0.2%
18	Malaysia	1	0.2%
19	Switzerland	1	0.2%
20	Iran, Islamic Republic of	1	0.2%
21	Ireland	1	0.2%