Frequency
Article 6
1. Member States shall provide the Commission (Eurostat) with the HICP, the HICP-CT and their respective sub-indices at monthly intervals, including those sub-indices produced at longer intervals. 2. Member States shall provide the Commission (Eurostat) with the OOH price index and the HPI at quarterly intervals. They may be provided at monthly intervals on a voluntary basis. 3. Member States shall not be required to produce sub-indices at monthly or quarterly intervals where less frequent data collection fulfils the comparability requirements of Article 4. Member States shall inform the Commission (Eurostat) of the ECOICOP, the OOH price index and the HPI categories for which they intend to collect data at intervals less frequent than monthly, in the case of ECOICOP categories, and quarterly, in the case of the OOH price index and the HPI categories. 4. Each year, Member States shall provide the Commission (Eurostat) with updated sub-index weights for the harmonised indices.