I just checked a 3 speed trigger shifter on my cable pull measuring tool, and I get 8.6mm for 1 to 2 and 15mm for 2 to 3.
I didn't even try my fisherman's scale on the hub because it has one lb increments very close together. I doubt I could get any useful info for you.
EDIT: See above, the shifter I measured was for the rotary hub, clearly different from the classic shifter as referenced by tcs above.