Component Amplification

That's not a simple question, but a good one.  Most of the difference will be in the music source.  Lower tones take more power to produce than higher tones, so that in itself skews the ratio heavily toward the woofers.  But that part of it is done in the recording and mixing of the music, with the final result of the recording heavily favoring signal strength (and thus output) in the woofer's range.

Another thing to look at is the octave range that each of the drivers will handle:  the woofer will see approx. 6 octaves as opposed to the tweeter, which will handle only about 3 octaves.  With the woofer handling, say, from 75 Hz up to 5k Hz, it will encompass a 6 octave range.  The tweeter takes care of only three octaves from 5k to 20k Hz.  That alone is a big difference in percentage of source material, and the power output ratio would be skewed toward the woofers again because of that.

The crossover for the tweeters often have some sort of resistor padding to attenuate their output so it doesn't come out too loud as compared to the woofer output....directly because the highest frequencies take very little power to reproduce, and tweeters are more efficient than woofers.   All in all, you may never hear the tweeters with more than about 10 watts actually applied (... I'm not entirely sure of that number...but it'll be around that...).