Rank	Countries/Territories	Count	Percent
1	United States	472	36.6%
2	China	291	22.5%
3	Germany	81	6.3%
4	Japan	80	6.2%
5	Zambia	43	3.3%
6	United Kingdom	33	2.6%
7	Canada	31	2.4%
8	India	27	2.1%
9	France	26	2%
10	Ireland	23	1.8%
11	Singapore	23	1.8%
12	Netherlands	21	1.6%
13	Australia	18	1.4%
14	Iran, Islamic Republic of	11	0.9%
15	Russia	11	0.9%
16	Egypt	8	0.6%
17	Italy	8	0.6%
18	Cyprus	6	0.5%
19	Iraq	6	0.5%
20	Brazil	6	0.5%
21	Israel	5	0.4%
22	Jordan	4	0.3%
23	Pakistan	4	0.3%
24	Philippines	4	0.3%
25	Saudi Arabia	4	0.3%
26	New Zealand	3	0.2%
27	Turkey	3	0.2%
28	Namibia	3	0.2%
29	Korea, Republic of	3	0.2%
30	Libya	3	0.2%
31	Algeria	3	0.2%
32	Colombia	2	0.2%
33	Lithuania	2	0.2%
34	Taiwan	2	0.2%
35	Romania	2	0.2%
36	Spain	2	0.2%
37	Switzerland	1	0.1%
38	Oman	1	0.1%
39	Rwanda	1	0.1%
40	Ukraine	1	0.1%
41	United Arab Emirates	1	0.1%
42	Yemen	1	0.1%
43	Malaysia	1	0.1%
44	Mexico	1	0.1%
45	Kenya	1	0.1%
46	Lebanon	1	0.1%
47	Poland	1	0.1%
48	Portugal	1	0.1%
49	Bulgaria	1	0.1%
50	Argentina	1	0.1%
51	Bahamas	1	0.1%
52	Belarus	1	0.1%
53	Greece	1	0.1%