| Año | Valor |
|---|---|
| 1960-01-01 | 1.678946 |
| 1961-01-01 | 2.224959 |
| 1962-01-01 | 2.513610 |
| 1963-01-01 | 5.242329 |
| 1964-01-01 | 6.504719 |
| 1965-01-01 | 6.367688 |
| 1966-01-01 | 6.866667 |
| 1967-01-01 | 6.668894 |
| 1968-01-01 | 7.532378 |
| 1969-01-01 | 7.883919 |
| 1970-01-01 | 8.781659 |
| 1971-01-01 | 9.113399 |
| 1972-01-01 | 10.131579 |
| 1973-01-01 | 10.995173 |
| 1974-01-01 | 10.531576 |
| 1975-01-01 | 11.675257 |
| 1976-01-01 | 13.665831 |
| 1977-01-01 | 15.874638 |
| 1978-01-01 | 17.314699 |
| 1979-01-01 | 17.881055 |
Fuente: World Bank