| Año | Valor |
|---|---|
| 1996-01-01 | 23.107604 |
| 1997-01-01 | 21.422339 |
| 1998-01-01 | 23.507066 |
| 1999-01-01 | 16.821977 |
| 2000-01-01 | 16.804779 |
| 2001-01-01 | 15.029636 |
| 2002-01-01 | 13.269719 |
| 2003-01-01 | 13.166954 |
| 2004-01-01 | 9.919243 |
| 2005-01-01 | 8.388913 |
| 2006-01-01 | 6.826976 |
| 2007-01-01 | 5.060732 |
| 2008-01-01 | 6.444257 |
| 2009-01-01 | 4.738376 |
| 2010-01-01 | 4.345227 |
| 2011-01-01 | 2.496816 |
| 2012-01-01 | 3.570124 |
| 2013-01-01 | 2.203313 |
| 2014-01-01 | 2.630001 |
| 2015-01-01 | 5.244918 |
Fuente: World Bank