From the DMG3.5 (pp139) we take the integrated community ratios and have:
|20%||Humanoids (incl. humans, goliaths, tabaxi, etc.)|
|18%||Goblinoids (incl. orcs, goblins, bugbears, etc.)|
The dragonkin are the big, "distant cousin to dragons" from Monsters of Faerun (pp44), half-dragons are the close descendants using the template from the Monster Manual (pp146). The big categories of lizardfolk, humanoids and goblinoids cover multiple races but for now this is our starting table.