I'm not certain if I ever saw such a table, but I did the next best thing:
I looked at Treasure Companion and saw the alchmist lvl spells you'd need to create true multipliers
lvl 6: +1 adder
lvl 10: +2 adder
Lvl 15: +3 Adder or x2 multiplier
Lvl 35: +4 adder or x3 multiplier
I usually stick close by the alchemist level.
as an aside: I sometimes hand out lesser multiplier: such as x1.1 and x1.25. x2 and x3 are such power boosters and players seem equally pleased to add 10% to their total as 100%.