40.3. Where, after 15 April 1987, Statistics Canada adopts a new time basis or content basis to establish either the amount of average weekly salaries and wages of the Industrial Composite in Canada for a month or the measurement prescribed under section 40.1 for a particular month, and where, as a result, there is between(1) the average, for that twelve-month period ending on 30 June of a year, of average weekly salaries and wages of the Industrial Composite in Canada or of the measurement prescribed under section 40.1 for each month within that period, computed using the former time basis or content basis, as the case may be; and
(2) the average, for that twelve-month period, of average weekly salaries and wages of the Industrial Composite in Canada or of the measurement prescribed under section 40.1 for each month within that period, computed using the new time basis or content basis,
a difference of more than 1% of the average, for that twelve-month period, of the amount of average weekly salaries and wages of the Industrial Composite in Canada or of the substitute measurement contemplated in section 40.1 for each month within that period, computed using the former time basis or content basis, the averages to be used for the purposes of the fifth and sixth paragraphs of section 40, for each twelve-month period affected by the change of basis, are adjusted by the Minister, in cooperation with the Minister of Manpower, Income Security and Vocational Training, in such a way as to take into account the data gathered according to the former basis.