| Año | Valor |
|---|---|
| 2000-01-01 | 37.171622 |
| 2001-01-01 | 37.913174 |
| 2002-01-01 | 38.149321 |
| 2003-01-01 | 38.270598 |
| 2004-01-01 | 38.391969 |
| 2005-01-01 | 38.512079 |
| 2006-01-01 | 38.627905 |
| 2007-01-01 | 38.743387 |
| 2008-01-01 | 38.870614 |
| 2009-01-01 | 39.006607 |
| 2010-01-01 | 39.153957 |
| 2011-01-01 | 39.312010 |
| 2012-01-01 | 39.482543 |
| 2013-01-01 | 39.663517 |
| 2014-01-01 | 39.858592 |
| 2015-01-01 | 40.067364 |
| 2016-01-01 | 40.289838 |
| 2017-01-01 | 40.526738 |
| 2018-01-01 | 40.778076 |
| 2019-01-01 | 40.979846 |
Fuente: World Bank