The Revision of the base year of Trade Indexes and the update of the previous data

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November 13, 2023

Ministry of Finance

On November 16, 2023 (press release of the trade statistics (October 2023 (Provisional)), the base year of Trade Indexes will be revised from Year 2015 to Year 2020. The revision of the base year has been conducted every five years.
The revised data will also be available in the web-site (search page etc.) on November 29, 2023.
In connection with the revision, the previous data of Trade Indexes will be updated based on the new base year.
The methods are as follows:

(1) Time series data (Yearly) of Trade Indexes
The data since 1960 will be revised.
The data from 1960 to 2019 will be updated based on coefficients calculated by comparing the indexes of the previous and the new base year on every sector.
The data since 2020 will be re-computed based on indexes of the new base year as 100.

Time series data (Yearly) of Trade Indexes (World) from 1960 to 2022 will be released on November 29, 2023.

(2) Time series data (Monthly) of Trade Indexes
The data since January 1998 will be revised.
The data from January 1998 to December 2019 will be updated based on coefficients calculated by comparing the indexes of the previous and the new base year on every sector.
The data since January 2020 will be re-computed based on the indexes of the new base year as 100.

Trade Indexes will be released on November 29, 2023.