| Año | Valor |
|---|---|
| 1987-01-01 | 85.000000 |
| 1988-01-01 | 85.749016 |
| 1989-01-01 | 86.432514 |
| 1990-01-01 | 87.058729 |
| 1991-01-01 | 87.634574 |
| 1992-01-01 | 88.165890 |
| 1993-01-01 | 88.657651 |
| 1994-01-01 | 89.114115 |
| 1995-01-01 | 89.538951 |
| 1996-01-01 | 89.935335 |
| 1997-01-01 | 90.306034 |
| 1998-01-01 | 90.653465 |
| 1999-01-01 | 90.979753 |
| 2000-01-01 | 91.090389 |
| 2001-01-01 | 91.199344 |
| 2002-01-01 | 91.306655 |
| 2003-01-01 | 91.412360 |
| 2004-01-01 | 91.516494 |
| 2005-01-01 | 91.619093 |
| 2006-01-01 | 91.720189 |
Fuente: World Bank