| Año | Valor |
|---|---|
| 1961-01-01 | 14.170000 |
| 1962-01-01 | 14.600000 |
| 1963-01-01 | 14.830000 |
| 1964-01-01 | 14.790000 |
| 1965-01-01 | 15.210000 |
| 1966-01-01 | 15.960000 |
| 1967-01-01 | 16.240000 |
| 1968-01-01 | 16.420000 |
| 1969-01-01 | 17.060000 |
| 1970-01-01 | 18.680000 |
| 1971-01-01 | 18.930000 |
| 1972-01-01 | 20.950000 |
| 1973-01-01 | 21.710000 |
| 1974-01-01 | 22.420000 |
| 1975-01-01 | 23.650000 |
| 1976-01-01 | 25.130000 |
| 1977-01-01 | 26.480000 |
| 1978-01-01 | 27.020000 |
| 1979-01-01 | 28.480000 |
| 1980-01-01 | 33.540000 |
Fuente: World Bank