Those numbers really don't say squat.
you can fiddle around numbers to make then look like any side is performing better.
let me give you an example;
Sparta/AW nations 150
NPO/MHA/FARK/UMB/SLAP nations 415
dmg done per nation in Sparta/aw; 10.666 NS DMG (not including dmg done to fark mha umb and slap. so figure should be even higher. but cant be arsed to add them'. you get my drift)
dmg done per nation in NPO coalition; 7.228 NS DMG (this one does include dmg done by fark mha unb and slap.)