| Año | Valor |
|---|---|
| 1996-01-01 | 7.359250 |
| 1997-01-01 | 9.369224 |
| 1998-01-01 | 8.987355 |
| 1999-01-01 | 9.110370 |
| 2000-01-01 | 9.509714 |
| 2001-01-01 | 8.984624 |
| 2002-01-01 | 10.173515 |
| 2003-01-01 | 12.611172 |
| 2004-01-01 | 12.811146 |
| 2005-01-01 | 14.023496 |
| 2006-01-01 | 13.204808 |
| 2007-01-01 | 12.108439 |
| 2008-01-01 | 10.589093 |
| 2009-01-01 | 9.990489 |
| 2010-01-01 | 9.448010 |
| 2011-01-01 | 10.844861 |
| 2012-01-01 | 11.248463 |
| 2013-01-01 | 11.564033 |
| 2014-01-01 | 12.779249 |
| 2015-01-01 | 12.359460 |
Fuente: World Bank