| Año | Valor |
|---|---|
| 1976-01-01 | 3.527026 |
| 1977-01-01 | 4.467823 |
| 1978-01-01 | 3.555938 |
| 1979-01-01 | 4.792742 |
| 1980-01-01 | 5.973642 |
| 1981-01-01 | 3.375850 |
| 1982-01-01 | 5.938457 |
| 1983-01-01 | 5.340503 |
| 1984-01-01 | 5.759616 |
| 1985-01-01 | 5.376053 |
| 1986-01-01 | 5.271933 |
| 1987-01-01 | 5.257599 |
| 1988-01-01 | 5.024335 |
| 1989-01-01 | 5.157675 |
| 1990-01-01 | 4.529532 |
| 1991-01-01 | 3.654155 |
| 1992-01-01 | 3.672068 |
| 1993-01-01 | 4.166975 |
| 1994-01-01 | 6.126554 |
| 1995-01-01 | 6.670607 |
Fuente: World Bank