| Año | Valor |
|---|---|
| 1996-01-01 | 38.618649 |
| 1997-01-01 | 26.655890 |
| 1998-01-01 | 22.070060 |
| 1999-01-01 | 22.195132 |
| 2000-01-01 | 17.441965 |
| 2001-01-01 | 29.237407 |
| 2002-01-01 | 25.224851 |
| 2003-01-01 | 31.490173 |
| 2004-01-01 | 25.314183 |
| 2005-01-01 | 16.146655 |
| 2006-01-01 | 19.747721 |
| 2007-01-01 | 8.495287 |
| 2008-01-01 | 8.473150 |
| 2009-01-01 | 9.558034 |
| 2010-01-01 | 7.862120 |
| 2011-01-01 | 5.515055 |
| 2012-01-01 | 5.660751 |
| 2013-01-01 | 5.345085 |
| 2014-01-01 | 4.584001 |
| 2015-01-01 | 6.019694 |
Fuente: World Bank