Rank	Countries/Territories	Count	Percent
1	United States	411	39.4%
2	China	207	19.8%
3	Germany	110	10.5%
4	Zambia	27	2.6%
5	Netherlands	26	2.5%
6	Japan	25	2.4%
7	France	23	2.2%
8	United Kingdom	23	2.2%
9		22	2.1%
10	South Africa	21	2%
11	India	17	1.6%
12	Australia	13	1.2%
13	Cyprus	13	1.2%
14	Singapore	11	1.1%
15	Russia	10	1%
16	Romania	7	0.7%
17	Portugal	6	0.6%
18	Norway	6	0.6%
19	Switzerland	6	0.6%
20	Italy	6	0.6%
21	Canada	6	0.6%
22	Hong Kong	5	0.5%
23	Brazil	5	0.5%
24	Turkey	5	0.5%
25	Ukraine	4	0.4%
26	Israel	4	0.4%
27	Denmark	3	0.3%
28	Mexico	3	0.3%
29	Moldova, Republic of	2	0.2%
30	Sweden	2	0.2%
31	Thailand	2	0.2%
32	Bangladesh	2	0.2%
33	Belgium	2	0.2%
34	Argentina	1	0.1%
35	Bulgaria	1	0.1%
36	Indonesia	1	0.1%
37	Taiwan	1	0.1%
38	Spain	1	0.1%
39	Mongolia	1	0.1%
40	Korea, Republic of	1	0.1%
41	Pakistan	1	0.1%