| Año | Valor |
|---|---|
| 1980-01-01 | 2975586524.392980 |
| 1981-01-01 | 2965664366.161100 |
| 1982-01-01 | 2163048692.492300 |
| 1983-01-01 | 2238591281.317640 |
| 1984-01-01 | 2163050576.965650 |
| 1985-01-01 | 2378016626.080820 |
| 1986-01-01 | 2576834172.466560 |
| 1987-01-01 | 2738347627.464150 |
| 1988-01-01 | 2709737921.978240 |
| 1989-01-01 | 3256371230.939760 |
| 1990-01-01 | 3517480312.000000 |
| 1991-01-01 | 3313741821.268690 |
| 1992-01-01 | 3153925243.592250 |
| 1993-01-01 | 3051488010.134050 |
| 1994-01-01 | 3592627905.749930 |
| 1995-01-01 | 4075142936.453420 |
| 1996-01-01 | 4390470862.264080 |
| 1997-01-01 | 4329230273.695800 |
| 1998-01-01 | 4452151847.182590 |
| 1999-01-01 | 3774777355.242250 |
Fuente: World Bank