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| Continents | Number of countries | Number of collections | Number of holdings | Average holdings/collection |
|---|---|---|---|---|
| Africa | 7 | 11 | 15 935 | 1448 |
| America | 11 | 178 | 497 894 | 2797 |
| Asia | 17 | 246 | 1 025 865 | 4170 |
| Europe | 33 | 232 | 889 837 | 3835 |
| Oceania | 4 | 41 | 105 379 | 2570 |
| Total | 72 | 708 | 2 534 910 | 3580 |
