| Año | Valor |
|---|---|
| 1985-01-01 | 2.666667 |
| 1986-01-01 | 1.431109 |
| 1987-01-01 | 2.574998 |
| 1988-01-01 | 4.525547 |
| 1989-01-01 | 5.368089 |
| 1990-01-01 | 4.541658 |
| 1991-01-01 | 4.616561 |
| 1992-01-01 | 4.583247 |
| 1993-01-01 | 3.955997 |
| 1994-01-01 | 2.571128 |
| 1995-01-01 | 2.277508 |
| 1996-01-01 | 5.527251 |
| 1997-01-01 | 6.646549 |
| 1998-01-01 | 6.878814 |
| 1999-01-01 | 7.403820 |
| 2000-01-01 | 7.090287 |
| 2001-01-01 | 6.070725 |
| 2002-01-01 | 6.722227 |
| 2003-01-01 | 6.325743 |
| 2004-01-01 | 7.013841 |
Fuente: World Bank