If you look at the same table you're referencing, nominal GDP is effectively the size, in nominal value, of the Canadian economy. We believe that the size of the Canadian economy for 2015 will be roughly $1.988 trillion, so in level terms, which is.... Nominal GDP is the broadest measure of the tax base. We tax based on consumption. We tax based on nominal level of income. When we look at nominal GDP, from a fiscal policy and tax policy perspective, that's the number we zero in on.
Indeed, growth rates may be consistent or may change over the time, but the target we're always keeping our eye on is the level of nominal GDP, which is representative, ultimately, of the tax base and what is consequential to tax collection.