| Año | Valor |
|---|---|
| 1960-01-01 | 9999.999776 |
| 1962-01-01 | 70000.000298 |
| 1963-01-01 | -59999.998659 |
| 1964-01-01 | 39999.999106 |
| 1965-01-01 | 29999.999329 |
| 1967-01-01 | 9999.999776 |
| 1968-01-01 | 19999.999553 |
| 1969-01-01 | 19999.999553 |
| 1970-01-01 | 19999.999553 |
| 1971-01-01 | 19999.999553 |
| 1972-01-01 | 310000.002384 |
| 1973-01-01 | 200000.002980 |
| 1974-01-01 | 250000.000000 |
| 1975-01-01 | 310000.002384 |
| 1976-01-01 | 239999.994636 |
| 1977-01-01 | 680000.007153 |
| 1978-01-01 | 259999.990463 |
| 1979-01-01 | 230000.004172 |
| 1980-01-01 | 79999.998212 |
| 1981-01-01 | 400000.005960 |
Fuente: World Bank