| 1 - | Data refer to the most recent year available during the period specified. |
| 2 - | Data refer to an earlier year outside the range of years specified. |
| 3 - | UNICEF (2005b). The State of the World's Children 2006. New York: UNICEF. |
| .. | Data not available |
| (.) | Greater (or less) than zero but small enough to be rounded off to zero at the displayed number of decimal points |
| < | Less than |
| - | Not applicable |
| T | Total |