| Año | Valor |
|---|---|
| 1976-01-01 | 50.360779 |
| 1977-01-01 | 57.035987 |
| 1978-01-01 | 61.389695 |
| 1979-01-01 | 60.899130 |
| 1980-01-01 | 66.587740 |
| 1981-01-01 | 61.248159 |
| 1982-01-01 | 66.030585 |
| 1983-01-01 | 82.431677 |
| 1984-01-01 | 76.674859 |
| 1985-01-01 | 97.877857 |
| 1986-01-01 | 155.349572 |
| 1987-01-01 | 146.679442 |
| 1988-01-01 | 115.340778 |
| 1989-01-01 | 94.906282 |
| 1990-01-01 | 94.609060 |
| 1991-01-01 | 81.606023 |
| 1992-01-01 | 79.549026 |
| 1993-01-01 | 79.589911 |
| 1994-01-01 | 85.625524 |
| 1995-01-01 | 82.341925 |
Fuente: World Bank