So wait.. you want a larger number? So hospitallers has the worst lost to total ratio, therefore making them the least effective clan in strategus?
In EU (don't know about NA) there is roughly a 1:1KD between the big faction wars (see the post Tomas linked to).
So if you have 80% that means you've used a lot of the troops you have farmed (which is good because it means you've had lots of fun battles/EXP)
It also means you will have killed lots of your enemy.
If you only have 20% or below it means you most likely haven't really done anything to effect strat and you're just stacking troops (like me
)