| Año | Valor |
|---|---|
| 1996-01-01 | 9.685763 |
| 1997-01-01 | 6.065816 |
| 1998-01-01 | 8.444949 |
| 1999-01-01 | 12.608406 |
| 2000-01-01 | 13.847075 |
| 2001-01-01 | 19.301839 |
| 2002-01-01 | 24.242144 |
| 2003-01-01 | 19.668265 |
| 2004-01-01 | 19.549304 |
| 2005-01-01 | 17.972597 |
| 2006-01-01 | 14.786338 |
| 2007-01-01 | 12.305577 |
| 2008-01-01 | 12.865522 |
| 2009-01-01 | 12.888502 |
| 2010-01-01 | 12.947446 |
| 2011-01-01 | 12.136023 |
| 2012-01-01 | 12.906037 |
| 2013-01-01 | 13.112146 |
| 2014-01-01 | 8.158960 |
| 2015-01-01 | 6.926276 |
Fuente: World Bank