Rank	Countries/Territories	Count	Percent
1	United States	228	34.4%
2	China	198	29.9%
3	Germany	50	7.5%
4	India	27	4.1%
5	France	19	2.9%
6	Japan	17	2.6%
7	Netherlands	14	2.1%
8	Singapore	12	1.8%
9	Zambia	11	1.7%
10	Taiwan	9	1.4%
11	Ireland	8	1.2%
12	Canada	8	1.2%
13	United Kingdom	6	0.9%
14	Italy	4	0.6%
15	Korea, Republic of	4	0.6%
16	Russia	4	0.6%
17	Saudi Arabia	3	0.5%
18	Nepal	3	0.5%
19	South Africa	3	0.5%
20	Iran, Islamic Republic of	3	0.5%
21	Egypt	3	0.5%
22	Cyprus	2	0.3%
23	Denmark	2	0.3%
24	Brazil	2	0.3%
25	Georgia	2	0.3%
26	Indonesia	2	0.3%
27	Mauritius	2	0.3%
28	Portugal	2	0.3%
29	Romania	2	0.3%
30	Nigeria	2	0.3%
31	Syrian Arab Republic	2	0.3%
32	Spain	1	0.2%
33	Switzerland	1	0.2%
34	Norway	1	0.2%
35	Pakistan	1	0.2%
36	Malaysia	1	0.2%
37	Australia	1	0.2%
38	Bangladesh	1	0.2%
39	Estonia	1	0.2%
40	Ethiopia	1	0.2%