| Año | Valor |
|---|---|
| 1976-01-01 | 31.320025 |
| 1977-01-01 | 40.710432 |
| 1978-01-01 | 51.604674 |
| 1979-01-01 | 61.114418 |
| 1980-01-01 | 28.928380 |
| 1981-01-01 | 29.642053 |
| 1982-01-01 | 25.738788 |
| 1983-01-01 | 34.632891 |
| 1984-01-01 | 60.021908 |
| 1985-01-01 | 88.968410 |
| 1986-01-01 | 110.680910 |
| 1987-01-01 | 124.438106 |
| 1988-01-01 | 51.177509 |
| 1989-01-01 | 28.620055 |
| 1990-01-01 | 15.500012 |
| 1991-01-01 | 15.388741 |
| 1992-01-01 | 22.253483 |
| 1993-01-01 | 22.868277 |
| 1994-01-01 | 25.012772 |
| 1995-01-01 | 24.297890 |
Fuente: World Bank