| Año | Valor |
|---|---|
| 1976-01-01 | 11.216859 |
| 1977-01-01 | 11.544805 |
| 1978-01-01 | 10.570919 |
| 1979-01-01 | 8.509554 |
| 1980-01-01 | 9.129594 |
| 1981-01-01 | 7.629769 |
| 1982-01-01 | 6.224628 |
| 1983-01-01 | 6.704824 |
| 1984-01-01 | 5.246548 |
| 1985-01-01 | 6.745226 |
| 1986-01-01 | 8.258747 |
| 1987-01-01 | 9.770540 |
| 1988-01-01 | 9.576138 |
| 1989-01-01 | 9.490275 |
| 1990-01-01 | 9.368963 |
| 1991-01-01 | 9.447301 |
| 1992-01-01 | 9.131833 |
| 1993-01-01 | 8.050979 |
| 1994-01-01 | 11.111111 |
| 1995-01-01 | 8.509423 |
Fuente: World Bank