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| Region | Mean ‘n’, 2000 | Number of countries with data | Mean ‘n’, 2010 | Number of countries with data | |
| AFR D | 2.09 | 3 | 1.16 | 9 | |
| AFR E | 1.90 | 6 | 1.33 | 14 | |
| AMR B | 1.62 | 2 | 3.23 | 3 | |
| AMR D | 1.88 | 1 | 1.12 | 2 | |
| EMR D | 4.23 | 2 | 4.03 | 2 | |
| EUR B | 5.20 | 1 | 4.03 | 2 | |
| EUR C | 11.30 | 1 | 2.28 | 2 | |
| SEAR B | 1.96 | 2 | NA | 0 | |
| SEAR D | 3.92 | 1 | 1.93 | 3 | |
| WPR B | 2.30 | 1 | 4.18 | 3 | |
| Overall | 3.40 | 20 | 2.88 | 40 |
NA: Not available
