| Año | Valor |
|---|---|
| 1980-01-01 | 21540000.915527 |
| 1981-01-01 | 28450000.762940 |
| 1982-01-01 | 10090000.152588 |
| 1983-01-01 | 10600000.381470 |
| 1984-01-01 | 9670000.076294 |
| 1985-01-01 | 11329999.923706 |
| 1986-01-01 | 19559999.465942 |
| 1987-01-01 | 31049999.237061 |
| 1988-01-01 | 29649999.618530 |
| 1989-01-01 | 48569999.694824 |
| 1990-01-01 | 57369998.931885 |
| 1991-01-01 | 80919998.168945 |
| 1992-01-01 | 80279998.779297 |
| 1993-01-01 | 93900001.525879 |
| 1994-01-01 | 68220001.220703 |
| 1995-01-01 | 68940002.441406 |
| 1996-01-01 | 104089996.337891 |
| 1997-01-01 | 47459999.084473 |
| 1998-01-01 | 61939998.626709 |
| 1999-01-01 | 58779998.779297 |
Fuente: World Bank