| Año | Valor |
|---|---|
| 1989-01-01 | 9999.999776 |
| 1991-01-01 | 209999.993443 |
| 1992-01-01 | 159999.996424 |
| 1993-01-01 | 140000.000596 |
| 1994-01-01 | 129999.995232 |
| 1995-01-01 | 270000.010729 |
| 1996-01-01 | 389999.985695 |
| 1997-01-01 | 140000.000596 |
| 1998-01-01 | 150000.005960 |
| 1999-01-01 | 59999.998659 |
| 2000-01-01 | 109999.999404 |
| 2001-01-01 | 500000.000000 |
| 2002-01-01 | 200000.002980 |
| 2003-01-01 | 540000.021458 |
| 2004-01-01 | 589999.973774 |
| 2005-01-01 | 4360000.133514 |
| 2006-01-01 | 4500000.000000 |
| 2007-01-01 | 8659999.847412 |
| 2008-01-01 | 5230000.019073 |
| 2009-01-01 | 1840000.033379 |
Fuente: World Bank