| Año | Valor |
|---|---|
| 1980-01-01 | 1.671539 |
| 1981-01-01 | 2.741200 |
| 1982-01-01 | 2.699698 |
| 1983-01-01 | 2.245881 |
| 1984-01-01 | 2.424568 |
| 1985-01-01 | 1.325732 |
| 1986-01-01 | 0.828129 |
| 1987-01-01 | 1.461567 |
| 1988-01-01 | 1.833203 |
| 1989-01-01 | 1.630558 |
| 1990-01-01 | 2.331639 |
| 1991-01-01 | 3.767167 |
| 1992-01-01 | 4.095577 |
| 1993-01-01 | 4.195419 |
| 1994-01-01 | 3.470694 |
| 1995-01-01 | 2.837862 |
| 1996-01-01 | 2.899762 |
| 1997-01-01 | 3.191048 |
| 1998-01-01 | 3.848257 |
| 1999-01-01 | 3.676362 |
Fuente: World Bank