| Año | Valor |
|---|---|
| 1990-01-01 | 8.253837 |
| 1991-01-01 | 2.943761 |
| 1992-01-01 | 5.431177 |
| 1993-01-01 | 2.036967 |
| 1994-01-01 | 2.018414 |
| 1995-01-01 | 2.219278 |
| 1996-01-01 | 1.575046 |
| 1997-01-01 | 1.152074 |
| 1998-01-01 | 1.913747 |
| 1999-01-01 | 1.906725 |
| 2000-01-01 | 0.876289 |
| 2001-01-01 | 1.180608 |
| 2002-01-01 | 1.218638 |
| 2003-01-01 | 1.310646 |
| 2004-01-01 | 1.255507 |
| 2005-01-01 | 1.302666 |
| 2006-01-01 | 1.813472 |
| 2007-01-01 | 1.981288 |
| 2008-01-01 | 1.699478 |
| 2009-01-01 | 1.733826 |
Fuente: World Bank