The human influence on present warming is probably far in excess of 10% of any underlying warming/cooling trend. The unprecedented (in at least the last million years) rapid and consistent increase in atmospheric CO2 concentration is very good evidence for this. The accurate figure for how you have defined it, would be on the order of (absolute value) 200-600% quite likely. But that's not how climate scientists talk about it so I wouldn't discuss it in those terms if you wish to be immediately comprehended.
