Rank	Countries/Territories	Count	Percent
1	United States	161	43.6%
2	China	51	13.8%
3	Germany	45	12.2%
4	Canada	17	4.6%
5	France	16	4.3%
6	South Africa	11	3%
7	Singapore	9	2.4%
8	Saudi Arabia	8	2.2%
9	Egypt	7	1.9%
10	United Kingdom	6	1.6%
11	Taiwan	6	1.6%
12	Japan	5	1.4%
13	Netherlands	4	1.1%
14	Iran, Islamic Republic of	4	1.1%
15	Ireland	4	1.1%
16	Poland	2	0.5%
17	Indonesia	2	0.5%
18	Greece	2	0.5%
19	Australia	2	0.5%
20	Cyprus	2	0.5%
21	Togo	2	0.5%
22	Ukraine	1	0.3%
23	Hungary	1	0.3%
24	Switzerland	1	0.3%