National CPIs are available at the most aggregate level: CPI All Items (COICOP 01-12) with a breakdown in 12 COICOP Divisions and some additional aggregates. Data are available at a monthly frequency for all countries except for Australia and New Zealand for which they are available at a quarterly frequency.
The annual expenditure weights are also available for the 12 COICOP Divisions (except Australia). Weights are defined as the proportion of total household expenditure spent on a given product during the weight reference period. The weights reported under year 'y-1' are those used for the computation of CPIs in year 'y' (e.g. the weights reported for the year 2014 are those used for the computation of CPIs in 2015).
The contributions to annual inflation are also available for the 12 COICOP Divisions (except Australia). They show how much each of the COICOP Divisions contributes to the annual inflation. All data are calculated by the OECD following the Ribe formula. However, data for Austria, Chile, Finland, Mexico, the Netherlands, Poland, Sweden, United-Kingdom are directly calculated by the National Statistical Offices. For further information, please see:
OECD calculation of contributions to overall annual inflation