| Año | Valor |
|---|---|
| 1985-01-01 | 20.559140 |
| 1986-01-01 | 12.396368 |
| 1987-01-01 | 15.271522 |
| 1988-01-01 | 9.787974 |
| 1989-01-01 | 8.645087 |
| 1990-01-01 | 6.388217 |
| 1991-01-01 | 5.387581 |
| 1992-01-01 | 6.095406 |
| 1993-01-01 | 4.702194 |
| 1994-01-01 | 5.658359 |
| 1995-01-01 | 6.030827 |
| 1996-01-01 | 5.013798 |
| 1997-01-01 | 5.984683 |
| 1998-01-01 | 6.198504 |
| 1999-01-01 | 5.006353 |
| 2000-01-01 | 5.093051 |
| 2001-01-01 | 4.446046 |
| 2002-01-01 | 3.900693 |
| 2003-01-01 | 3.223037 |
| 2004-01-01 | 3.106222 |
Fuente: World Bank