| Año | Valor |
|---|---|
| 1961-01-01 | 3.488167 |
| 1962-01-01 | 3.560872 |
| 1963-01-01 | 3.636032 |
| 1964-01-01 | 3.713649 |
| 1965-01-01 | 3.793775 |
| 1966-01-01 | 3.876627 |
| 1967-01-01 | 3.962496 |
| 1968-01-01 | 4.051458 |
| 1969-01-01 | 4.143111 |
| 1970-01-01 | 4.237063 |
| 1971-01-01 | 4.333372 |
| 1972-01-01 | 4.431808 |
| 1973-01-01 | 4.532632 |
| 1974-01-01 | 4.636273 |
| 1975-01-01 | 4.742490 |
| 1976-01-01 | 4.852299 |
| 1977-01-01 | 4.965537 |
| 1978-01-01 | 5.080885 |
| 1979-01-01 | 5.197867 |
| 1980-01-01 | 5.316071 |
Fuente: World Bank