Rank	Countries/Territories	Count	Percent
1	United States	358	36.8%
2	China	331	34%
3	Germany	150	15.4%
4	Canada	32	3.3%
5	Japan	19	2%
6	Switzerland	14	1.4%
7	Singapore	10	1%
8	Netherlands	8	0.8%
9	India	7	0.7%
10	South Africa	6	0.6%
11	France	6	0.6%
12	Ireland	5	0.5%
13	Turkey	4	0.4%
14	United Kingdom	4	0.4%
15	Taiwan	3	0.3%
16	Iran, Islamic Republic of	3	0.3%
17	Australia	3	0.3%
18	Argentina	2	0.2%
19	Cyprus	2	0.2%
20	Malaysia	2	0.2%
21	Spain	2	0.2%
22	Morocco	1	0.1%
23	Greece	1	0.1%
24	Thailand	1	0.1%