| Año | Valor |
|---|---|
| 1996-01-01 | 0.144654 |
| 1997-01-01 | 1.071194 |
| 1998-01-01 | 1.040307 |
| 1999-01-01 | 1.158712 |
| 2000-01-01 | 1.510743 |
| 2001-01-01 | 1.661607 |
| 2002-01-01 | 1.428122 |
| 2003-01-01 | 1.956924 |
| 2004-01-01 | 2.399952 |
| 2005-01-01 | 3.529539 |
| 2006-01-01 | 5.265301 |
| 2007-01-01 | 8.043886 |
| 2008-01-01 | 6.805204 |
| 2009-01-01 | 6.101098 |
| 2010-01-01 | 4.886648 |
| 2011-01-01 | 4.352500 |
| 2012-01-01 | 4.100250 |
| 2013-01-01 | 3.918348 |
| 2014-01-01 | 3.566976 |
| 2015-01-01 | 3.608943 |
Fuente: World Bank