| Año | Valor |
|---|---|
| 1960-01-01 | 0.001210 |
| 1961-01-01 | 0.001289 |
| 1962-01-01 | 0.001381 |
| 1963-01-01 | 0.001456 |
| 1964-01-01 | 0.001607 |
| 1965-01-01 | 0.001747 |
| 1966-01-01 | 0.001893 |
| 1967-01-01 | 0.002092 |
| 1968-01-01 | 0.002322 |
| 1969-01-01 | 0.002461 |
| 1970-01-01 | 0.002632 |
| 1971-01-01 | 0.002773 |
| 1972-01-01 | 0.003483 |
| 1973-01-01 | 0.005147 |
| 1974-01-01 | 0.008368 |
| 1975-01-01 | 0.009366 |
| 1976-01-01 | 0.010400 |
| 1977-01-01 | 0.012006 |
| 1978-01-01 | 0.013663 |
| 1979-01-01 | 0.016021 |
Fuente: World Bank