| Año | Valor |
|---|---|
| 1990-01-01 | 0.629949 |
| 1991-01-01 | 0.685049 |
| 1992-01-01 | 0.761734 |
| 1993-01-01 | 0.814332 |
| 1994-01-01 | 0.815519 |
| 1995-01-01 | 0.943506 |
| 1996-01-01 | 0.782852 |
| 1997-01-01 | 0.713166 |
| 1998-01-01 | 0.561863 |
| 1999-01-01 | 0.411574 |
| 2000-01-01 | 0.361399 |
| 2001-01-01 | 0.406277 |
| 2002-01-01 | 0.417840 |
| 2003-01-01 | 0.481904 |
| 2004-01-01 | 0.459734 |
| 2005-01-01 | 0.464508 |
| 2006-01-01 | 0.593578 |
| 2007-01-01 | 0.603824 |
| 2008-01-01 | 0.540487 |
| 2009-01-01 | 0.512194 |
Fuente: World Bank