| Año | Valor |
|---|---|
| 1988-12-31 | 14219988000.000000 |
| 1989-12-31 | 14758942000.000000 |
| 1990-12-31 | 15443136000.000000 |
| 1991-12-31 | 16256454000.000000 |
| 1992-12-31 | 16524115000.000000 |
| 1993-12-31 | 17229579000.000000 |
| 1994-12-31 | 18033727000.000000 |
| 1995-12-31 | 18877397000.000000 |
| 1996-12-31 | 19700706000.000000 |
| 1997-12-31 | 20676717000.000000 |
| 1998-12-31 | 21716623000.000000 |
| 1999-12-31 | 21809328000.000000 |
| 2000-12-31 | 22356266000.000000 |
| 2001-12-31 | 22732700000.000000 |
| 2002-12-31 | 23297736000.000000 |
| 2003-12-31 | 23929418000.000000 |
| 2004-12-31 | 24928063000.000000 |
| 2005-12-31 | 26030240000.000000 |
| 2006-12-31 | 27278913000.000000 |
| 2007-12-31 | 28524027000.000000 |
Fuente: World Bank