Rank	Countries/Territories	Count	Percent
1	United States	263	27.7%
2	China	217	22.8%
3	India	171	18%
4	Brazil	32	3.4%
5	Germany	31	3.3%
6	Japan	25	2.6%
7	Russia	20	2.1%
8	Zambia	19	2%
9	Netherlands	15	1.6%
10	Australia	15	1.6%
11	United Kingdom	14	1.5%
12	Canada	11	1.2%
13	Iran, Islamic Republic of	11	1.2%
14	Korea, Republic of	11	1.2%
15	Italy	9	0.9%
16	South Africa	7	0.7%
17	Switzerland	7	0.7%
18	Turkey	6	0.6%
19	Pakistan	6	0.6%
20	Israel	6	0.6%
21	Colombia	6	0.6%
22	Ethiopia	5	0.5%
23	Ireland	4	0.4%
24	Portugal	4	0.4%
25	Romania	4	0.4%
26	Singapore	3	0.3%
27	Taiwan	2	0.2%
28	Thailand	2	0.2%
29	Peru	2	0.2%
30	Mexico	2	0.2%
31	France	2	0.2%
32	Denmark	2	0.2%
33	Egypt	1	0.1%
34	Czech Republic	1	0.1%
35	Bangladesh	1	0.1%
36	Belgium	1	0.1%
37	Guatemala	1	0.1%
38	Hong Kong	1	0.1%
39	Argentina	1	0.1%
40	Morocco	1	0.1%
41	Norway	1	0.1%
42	Oman	1	0.1%
43	Lithuania	1	0.1%
44	Malaysia	1	0.1%
45	Philippines	1	0.1%
46	Qatar	1	0.1%
47	Rwanda	1	0.1%
48	Sweden	1	0.1%
49	Ukraine	1	0.1%