How Much Damage Does Thunderlord's Actually Do?

In case people are curious how much damage Thunderlord's is doing for you. I just got done playing a damage as Talon and I was looking at the breakdown of my damage. I did a pretty hefty 49,711 damage to champions (Granted I was stupidly fed). Curious to see how much damage Thunderlord's was actually doing for me I look at the magic damage dealth. (Since Talon does 0 magic damage on his own).

Edit: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2055411224/39816033?tab=overview

43,571 of that damage was physical. 87.64% 4,253 of the damage was magical. 8.55% 1,887 of the damage was true damage. (Ignite and red buff) 3.79%

So Thunderlord's was making up roughly 8% of my damage done to champions. That is really a huge amount considering it's CD and Talon being 100% physical damage. Granted this is just one case of a game. But it can give you an idea of how much damage Thunderlord's does.

tl;dr Thunderlord's does a decent amount of your overall damage.