| Año | Valor |
|---|---|
| 1990-01-01 | 70.380401 |
| 1991-01-01 | 68.807882 |
| 1992-01-01 | 71.694858 |
| 1993-01-01 | 73.710248 |
| 1994-01-01 | 77.914966 |
| 1995-01-01 | 83.679941 |
| 1996-01-01 | 89.652856 |
| 1997-01-01 | 93.508428 |
| 1998-01-01 | 90.265395 |
| 1999-01-01 | 87.965870 |
| 2000-01-01 | 69.068560 |
| 2001-01-01 | 72.346913 |
| 2002-01-01 | 83.965735 |
| 2003-01-01 | 83.796963 |
| 2004-01-01 | 81.648782 |
| 2005-01-01 | 86.254689 |
| 2006-01-01 | 83.850351 |
| 2007-01-01 | 81.856022 |
| 2008-01-01 | 78.691998 |
| 2009-01-01 | 79.311606 |
Fuente: World Bank