| Año | Valor |
|---|---|
| 1996-01-01 | 31.221895 |
| 1997-01-01 | 31.851632 |
| 1998-01-01 | 29.617122 |
| 1999-01-01 | 28.912985 |
| 2000-01-01 | 39.848336 |
| 2001-01-01 | 33.536204 |
| 2002-01-01 | 29.121397 |
| 2003-01-01 | 21.416750 |
| 2004-01-01 | 19.772874 |
| 2005-01-01 | 15.663521 |
| 2006-01-01 | 9.696150 |
| 2007-01-01 | 13.953707 |
| 2008-01-01 | 12.901309 |
| 2009-01-01 | 10.326927 |
| 2010-01-01 | 9.477805 |
| 2011-01-01 | 4.823568 |
| 2012-01-01 | 5.247560 |
| 2013-01-01 | 4.255669 |
| 2014-01-01 | 6.977644 |
| 2015-01-01 | 9.898840 |
Fuente: World Bank