| Año | Valor |
|---|---|
| 1970-01-01 | 196.274400 |
| 1971-01-01 | 178.142497 |
| 1972-01-01 | 167.709831 |
| 1973-01-01 | 122.679896 |
| 1974-01-01 | 54.408665 |
| 1975-01-01 | 79.333478 |
| 1976-01-01 | 96.338711 |
| 1977-01-01 | 91.910566 |
| 1978-01-01 | 115.498175 |
| 1979-01-01 | 101.123942 |
| 1980-01-01 | 54.666938 |
| 1981-01-01 | 70.544190 |
| 1982-01-01 | 42.018787 |
| 1983-01-01 | 61.190967 |
| 1984-01-01 | 95.476522 |
| 1985-01-01 | 133.211115 |
| 1986-01-01 | 147.528381 |
| 1987-01-01 | 156.369941 |
| 1988-01-01 | 74.614375 |
| 1989-01-01 | 45.250759 |
Fuente: World Bank