| Año | Valor |
|---|---|
| 1981-01-01 | 31200000.762940 |
| 1982-01-01 | 29819999.694824 |
| 1983-01-01 | 34700000.762940 |
| 1984-01-01 | 29629999.160767 |
| 1985-01-01 | 22610000.610352 |
| 1986-01-01 | 23790000.915527 |
| 1987-01-01 | 53810001.373291 |
| 1988-01-01 | 35330001.831055 |
| 1989-01-01 | 92879997.253418 |
| 1990-01-01 | 95209999.084473 |
| 1991-01-01 | 55139999.389648 |
| 1992-01-01 | 87180000.305176 |
| 1993-01-01 | 61110000.610352 |
| 1994-01-01 | 80440002.441406 |
| 1995-01-01 | 93279998.779297 |
| 1996-01-01 | 98029998.779297 |
| 1997-01-01 | 65000000.000000 |
| 1998-01-01 | 41369998.931885 |
| 1999-01-01 | 41490001.678467 |
| 2000-01-01 | 43729999.542236 |
Fuente: World Bank