12.0.1. The percentage provided for in subparagraph 3 of the first paragraph of section 12 is increased, effective as of 1 April 2012, by 1.25 times the difference between the cumulative growth of the nominal gross domestic product (GDP) of Québec according to the data from Statistics Canada for 2010 and 2011 and the forecasted cumulative growth of the nominal GDP of Québec for the same years, established at 3.8% for 2010 and at 4.5% for 2011. The increase so calculated may not be greater than 0.5%.