| Año | Valor |
|---|---|
| 1996-01-01 | 12.069212 |
| 1997-01-01 | 12.582138 |
| 1998-01-01 | 12.822161 |
| 1999-01-01 | 10.657471 |
| 2000-01-01 | 11.015088 |
| 2001-01-01 | 11.256233 |
| 2002-01-01 | 12.297067 |
| 2003-01-01 | 14.485720 |
| 2004-01-01 | 17.046646 |
| 2005-01-01 | 19.882483 |
| 2006-01-01 | 26.582245 |
| 2007-01-01 | 28.636098 |
| 2008-01-01 | 28.983281 |
| 2009-01-01 | 22.899887 |
| 2010-01-01 | 24.849139 |
| 2011-01-01 | 26.317418 |
| 2012-01-01 | 25.694056 |
| 2013-01-01 | 23.890940 |
| 2014-01-01 | 20.789478 |
| 2015-01-01 | 14.216925 |
Fuente: World Bank