| Año | Valor |
|---|---|
| 1961-01-01 | 2.089296 |
| 1962-01-01 | 5.578918 |
| 1963-01-01 | 6.797626 |
| 1964-01-01 | 3.956597 |
| 1965-01-01 | 4.913442 |
| 1966-01-01 | 7.170590 |
| 1967-01-01 | 6.317220 |
| 1968-01-01 | 8.529443 |
| 1969-01-01 | 4.474097 |
| 1970-01-01 | 5.231029 |
| 1971-01-01 | 5.063336 |
| 1972-01-01 | 7.967485 |
| 1973-01-01 | 5.739162 |
| 1974-01-01 | 2.939568 |
| 1975-01-01 | 7.311018 |
| 1976-01-01 | 4.614567 |
| 1977-01-01 | 4.971216 |
| 1978-01-01 | 2.052695 |
| 1979-01-01 | 0.133344 |
| 1980-01-01 | -1.371773 |
Fuente: World Bank