| Año | Valor |
|---|---|
| 1976-01-01 | 16.331608 |
| 1977-01-01 | 14.671498 |
| 1978-01-01 | 14.869285 |
| 1979-01-01 | 14.621439 |
| 1980-01-01 | 14.185369 |
| 1981-01-01 | 10.530365 |
| 1982-01-01 | 8.624008 |
| 1983-01-01 | 12.751014 |
| 1984-01-01 | 12.157898 |
| 1985-01-01 | 10.161171 |
| 1986-01-01 | 3.770619 |
| 1987-01-01 | 4.770287 |
| 1988-01-01 | 6.792827 |
| 1989-01-01 | 8.613772 |
| 1990-01-01 | 9.545988 |
| 1991-01-01 | 8.884364 |
| 1992-01-01 | 8.480555 |
| 1993-01-01 | 7.798748 |
| 1994-01-01 | 10.199566 |
| 1995-01-01 | 11.168787 |
Fuente: World Bank