| Año | Valor |
|---|---|
| 2000-01-01 | 3.700457 |
| 2001-01-01 | 4.509599 |
| 2002-01-01 | 5.024993 |
| 2003-01-01 | 4.372753 |
| 2004-01-01 | 3.455057 |
| 2005-01-01 | 2.741196 |
| 2006-01-01 | 1.913291 |
| 2007-01-01 | 1.489714 |
| 2008-01-01 | 1.386845 |
| 2009-01-01 | 1.417812 |
| 2010-01-01 | 1.407870 |
| 2011-01-01 | 1.420578 |
| 2012-01-01 | 1.466431 |
| 2013-01-01 | 1.671392 |
| 2014-01-01 | 1.843405 |
| 2015-01-01 | 2.418007 |
| 2016-01-01 | 3.138654 |
| 2017-01-01 | 3.387404 |
| 2018-01-01 | 4.047299 |
| 2019-01-01 | 5.511078 |
Fuente: World Bank