| Año | Valor |
|---|---|
| 1976-01-01 | 7.591417 |
| 1977-01-01 | 7.516143 |
| 1978-01-01 | 7.989149 |
| 1979-01-01 | 11.034253 |
| 1980-01-01 | 7.783640 |
| 1981-01-01 | 7.143747 |
| 1982-01-01 | 5.428193 |
| 1983-01-01 | 6.420381 |
| 1984-01-01 | 5.624621 |
| 1985-01-01 | 6.371255 |
| 1986-01-01 | 9.266594 |
| 1987-01-01 | 9.238823 |
| 1988-01-01 | 8.332587 |
| 1989-01-01 | 9.361800 |
| 1990-01-01 | 9.378372 |
| 1991-01-01 | 8.762437 |
| 1992-01-01 | 8.426844 |
| 1993-01-01 | 8.772910 |
| 1994-01-01 | 8.919581 |
| 1995-01-01 | 8.080222 |
Fuente: World Bank