I'll speak to that first, and Mr. Bélanger may want to round out my answer.
Indeed, estimating the losses of tax revenues for the various levels of government is extremely tough. Tax havens are, by definition, opaque jurisdictions. That's the first thing I would say. For our part, we've always tended to use the most conservative figures, so as not to magnify the problem, while making sure our estimates are credible.
However, when we compare a minimum annual loss in tax revenues of $6 billion and the health transfer cuts imposed on the provinces through the new agreement, that $6 billion would represent a shortfall, proportionally speaking, in Quebec, of just over a billion dollars, around $1.2 billion.
The provinces adopted austerity policies, not just because of the shortfall, but also because of the cuts to health and education transfers that began in the mid-1990s. If we were able to go after that revenue being withheld from us, to some extent, unlawfully, our quality of life would go up.
Incidentally, the CSN has done studies on quality of life. Investments in public services and social programs rank among the leading factors, but in order to make those investments, you need to have the money and you need to go after it where it is.