| Año | Valor |
|---|---|
| 1990-01-01 | 30889999.389648 |
| 1991-01-01 | 35930000.305176 |
| 1992-01-01 | 28360000.610352 |
| 1993-01-01 | 34669998.168945 |
| 1994-01-01 | 33069999.694824 |
| 1995-01-01 | 57000000.000000 |
| 1996-01-01 | 57049999.237061 |
| 1997-01-01 | 59759998.321533 |
| 1998-01-01 | 67550003.051758 |
| 1999-01-01 | 27219999.313355 |
| 2000-01-01 | 33250000.000000 |
| 2001-01-01 | 73309997.558594 |
| 2002-01-01 | 62590000.152588 |
| 2003-01-01 | 50319999.694824 |
| 2004-01-01 | 48060001.373291 |
| 2005-01-01 | 46680000.305176 |
| 2006-01-01 | 34409999.847412 |
| 2007-01-01 | 48259998.321533 |
| 2008-01-01 | 41430000.305176 |
| 2009-01-01 | 45560001.373291 |
Fuente: World Bank