| Año | Valor |
|---|---|
| 1976-01-01 | 54.384772 |
| 1977-01-01 | 52.611325 |
| 1978-01-01 | 57.805531 |
| 1979-01-01 | 65.707006 |
| 1980-01-01 | 53.346228 |
| 1981-01-01 | 60.006254 |
| 1982-01-01 | 52.503383 |
| 1983-01-01 | 57.931316 |
| 1984-01-01 | 51.282051 |
| 1985-01-01 | 57.700122 |
| 1986-01-01 | 63.140765 |
| 1987-01-01 | 53.441895 |
| 1988-01-01 | 51.883830 |
| 1989-01-01 | 57.075788 |
| 1990-01-01 | 57.759176 |
| 1991-01-01 | 55.269923 |
| 1992-01-01 | 53.729904 |
| 1993-01-01 | 54.367423 |
| 1994-01-01 | 52.681481 |
| 1995-01-01 | 60.308395 |
Fuente: World Bank