Using liquid viscosity and the time taken to flow out a tub, how can i work out the rate of exponential decay?

I have several liquids of different viscosities and have found out how long they take to flow out of a container. How can i work out the rate of exponential decay? I took readings at each 100ml marker.

Answers:
Just a suggestion:

Try plotting the graphs for each of the experiments you have preformed making sure they are exponential, then log them to give you nice straight lines.

Once you have done this, you will have to compare them side by side (preferably all the liquids on the same graph, so that you can see clearly how the viscosity changes).

Maybe someone else will have a "magic formulae" for you to use that will show nicely how it works (possiby the viscosity will become a constant "k" somwhere in the linear line equasion that will determine it's gradient).
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