| Año | Valor |
|---|---|
| 1960-01-01 | 7.345390 |
| 1961-01-01 | 4.269294 |
| 1962-01-01 | 5.988361 |
| 1963-01-01 | 6.485356 |
| 1964-01-01 | 12.440043 |
| 1965-01-01 | 11.740947 |
| 1966-01-01 | 11.018868 |
| 1967-01-01 | 10.780711 |
| 1968-01-01 | 13.755887 |
| 1969-01-01 | 14.396958 |
| 1970-01-01 | 16.611488 |
| 1971-01-01 | 13.836816 |
| 1972-01-01 | 17.230861 |
| 1973-01-01 | 19.808484 |
| 1974-01-01 | 23.076191 |
| 1975-01-01 | 16.744254 |
| 1976-01-01 | 16.971848 |
| 1977-01-01 | 16.286524 |
| 1978-01-01 | 17.181724 |
| 1979-01-01 | 17.610021 |
Fuente: World Bank