12.0.4. The salary classes in force on 30 March 2015 are increased, effective as of 31 March 2015, by a percentage equal to the difference between the sum of the annual changes in the Consumer Price Index for Québec according to the data of Statistics Canada for the annual periods referred to in section 12 and the sum of the annual parameters determined in sections 12 to 12.0.3. The increase so calculated may not be greater than 1%.