For me it's something like this:
99% makes it out of The Dungeon. (Mostly thanks to the DBG.
)
75% gets to the Brynnlaw.
20% manages to survive the Underdark.
5% are still standing at the Suldanessar (Sorry about spelling if wrong [img]tongue.gif[/img] )
And 1% finishes the game.
Seriously, only three (3) of my parties/solos I have played through the whole SoA. And two of them started ToB, but only once I have finished it. Seriously! Only one time through ToB..
