This might be naive of me, but how did you have a billion euro risk on a portfolio of 2 billion euros? How do you assess that risk to now be instead 50 million euros?

With respect, this seems like numbers were plucked out of somewhere. I propose that, if these come from a statistical model, it's the model that paints your position in the most optimistic light.

I don't judge you for that, but you should really read this article and look out for other fallacies of statistics.