| Año | Valor |
|---|---|
| 1990-01-01 | 68.386093 |
| 1991-01-01 | 71.536909 |
| 1992-01-01 | 74.510428 |
| 1993-01-01 | 69.087461 |
| 1994-01-01 | 70.454578 |
| 1995-01-01 | 75.977879 |
| 1996-01-01 | 79.107656 |
| 1997-01-01 | 79.630059 |
| 1998-01-01 | 82.143893 |
| 1999-01-01 | 78.586043 |
| 2000-01-01 | 75.782209 |
| 2001-01-01 | 78.583463 |
| 2002-01-01 | 89.091862 |
| 2003-01-01 | 90.877313 |
| 2004-01-01 | 94.523580 |
| 2005-01-01 | 92.749214 |
| 2006-01-01 | 90.794621 |
| 2007-01-01 | 88.129819 |
| 2008-01-01 | 92.695686 |
| 2009-01-01 | 83.308869 |
Fuente: World Bank