Provisional figures are those belonging to year (t-2), where (t) is the current year.
Preliminary figures are those belonging to years (t) and (t-1), where (t) is the current year.
The contributions to GDP growth are calculated from the series at previous year prices compiled under the chained index method. By definition, these contributions are additive and allow an appropriate year to year economic analysis.
For further details about the calculation method of the contributions, refer to Studies in Economic Statistics N° 100 available in www.bcentral.cl
The chained volume series at previous year prices is obtained from the 2013 average index referenced to the series at current prices in that year. Chained series lose the additivity property of fixed based series; therefore the aggregates differ from the sum of their components.