I've heard estimates of ~2T left country over ~10 years - this kind of money supposedly surfaces around, about half in US, a lot in UK. The economy is heavily

I've heard estimates of ~2T left country over ~10 years - this kind of money supposedly surfaces around, about half in US, a lot in UK. The economy is heavily linked to oil and gas prices. This is a sort of "specialization" of the country - with exception of arms and some space tech, other sectors of economy are in rather modest shape. Recent estimate was that productivity is behind leading countries by a few decades (e.g. as it was in US in 1980-s).