| Año | Valor |
|---|---|
| 1986-01-01 | 5.023687 |
| 1987-01-01 | 8.719300 |
| 1988-01-01 | 6.896072 |
| 1989-01-01 | 7.161272 |
| 1990-01-01 | 6.405803 |
| 1991-01-01 | 6.528180 |
| 1992-01-01 | 8.267512 |
| 1993-01-01 | 8.660115 |
| 1994-01-01 | 11.453720 |
| 1995-01-01 | 12.546119 |
| 1996-01-01 | 9.944011 |
| 1997-01-01 | 8.992240 |
| 1998-01-01 | 8.636930 |
| 1999-01-01 | 6.536274 |
| 2000-01-01 | 8.726884 |
| 2001-01-01 | 10.544112 |
| 2002-01-01 | 10.658064 |
| 2003-01-01 | 11.090004 |
| 2004-01-01 | 10.430508 |
| 2005-01-01 | 9.997973 |
Fuente: World Bank