| Año | Valor |
|---|---|
| 1996-01-01 | 59.578449 |
| 1997-01-01 | 61.861776 |
| 1998-01-01 | 61.225880 |
| 1999-01-01 | 58.661330 |
| 2000-01-01 | 57.748888 |
| 2001-01-01 | 46.826062 |
| 2002-01-01 | 39.200775 |
| 2003-01-01 | 34.121182 |
| 2004-01-01 | 32.327987 |
| 2005-01-01 | 34.322557 |
| 2006-01-01 | 33.264478 |
| 2007-01-01 | 33.860476 |
| 2008-01-01 | 39.533721 |
| 2009-01-01 | 37.857383 |
| 2010-01-01 | 40.595839 |
| 2011-01-01 | 44.533276 |
| 2012-01-01 | 42.251985 |
| 2013-01-01 | 30.345690 |
| 2014-01-01 | 27.253527 |
| 2015-01-01 | 27.174108 |
Fuente: World Bank