It can't possibly be 3.1.1! More likely 3.6.1...
That's because the added values must always be 10.
And now here is what it actually means: It's yor tax-ratios but not in percent but in um... perdec
So 3.6.1 would be 30% Taxes, 60% Science and 10% Luxuries...
Btw.: I was wondering about the same thing back in the 1st Civilization