Rank	Countries/Territories	Count	Percent
1	United States	170	44.6%
2	China	111	29.1%
3	Germany	21	5.5%
4	Bulgaria	12	3.1%
5	Netherlands	12	3.1%
6	Japan	9	2.4%
7	Ukraine	8	2.1%
8	Singapore	7	1.8%
9	Cyprus	5	1.3%
10	Portugal	4	1%
11	Lithuania	4	1%
12	France	3	0.8%
13	Australia	2	0.5%
14	Latvia	2	0.5%
15	Nigeria	2	0.5%
16	Serbia	2	0.5%
17	Iran, Islamic Republic of	2	0.5%
18	United Kingdom	1	0.3%
19	South Africa	1	0.3%
20	Switzerland	1	0.3%
21	Mexico	1	0.3%
22	India	1	0.3%