| Año | Valor |
|---|---|
| 1996-01-01 | 5.826481 |
| 1997-01-01 | 6.231009 |
| 1998-01-01 | 5.268002 |
| 1999-01-01 | 5.246889 |
| 2000-01-01 | 7.849079 |
| 2001-01-01 | 6.943239 |
| 2002-01-01 | 6.272004 |
| 2003-01-01 | 5.594068 |
| 2004-01-01 | 6.217883 |
| 2005-01-01 | 5.806937 |
| 2006-01-01 | 4.021393 |
| 2007-01-01 | 5.882309 |
| 2008-01-01 | 5.891483 |
| 2009-01-01 | 3.508743 |
| 2010-01-01 | 3.495256 |
| 2011-01-01 | 1.943845 |
| 2012-01-01 | 2.556124 |
| 2013-01-01 | 1.912853 |
| 2014-01-01 | 3.143579 |
| 2015-01-01 | 3.117666 |
Fuente: World Bank