| Año | Valor |
|---|---|
| 1961-01-01 | 80317.969181 |
| 1962-01-01 | 78678.042967 |
| 1963-01-01 | 77051.714521 |
| 1964-01-01 | 75441.288035 |
| 1965-01-01 | 73847.947684 |
| 1966-01-01 | 72269.647938 |
| 1967-01-01 | 70703.531589 |
| 1968-01-01 | 69151.030407 |
| 1969-01-01 | 67621.281609 |
| 1970-01-01 | 66121.860301 |
| 1971-01-01 | 64652.298448 |
| 1972-01-01 | 63216.286348 |
| 1973-01-01 | 61810.109568 |
| 1974-01-01 | 60428.374457 |
| 1975-01-01 | 59074.977338 |
| 1976-01-01 | 57738.082555 |
| 1977-01-01 | 56421.385769 |
| 1978-01-01 | 55140.482871 |
| 1979-01-01 | 53899.509648 |
| 1980-01-01 | 52701.036656 |
Fuente: World Bank