| Año | Valor |
|---|---|
| 2001-01-01 | 8.079697 |
| 2002-01-01 | 8.215965 |
| 2003-01-01 | 8.354749 |
| 2004-01-01 | 8.496526 |
| 2005-01-01 | 8.640962 |
| 2006-01-01 | 8.789522 |
| 2007-01-01 | 8.941161 |
| 2008-01-01 | 9.093379 |
| 2009-01-01 | 9.246077 |
| 2010-01-01 | 9.399377 |
| 2011-01-01 | 9.553151 |
| 2012-01-01 | 9.707197 |
| 2013-01-01 | 9.861172 |
| 2014-01-01 | 10.014666 |
| 2015-01-01 | 10.167733 |
| 2016-01-01 | 10.320336 |
| 2017-01-01 | 10.472249 |
| 2018-01-01 | 10.623436 |
| 2019-01-01 | 10.773919 |
| 2020-01-01 | 10.907689 |
Fuente: World Bank