Looking for a money market fund index for past 20 yrs?

I'm looking for a money market fund index that tracks the average rate of return for taxable money market funds for the past 20 yrs. Preferably in a graph. Any info or direction would be greatly appreciated.
 
Thanks Nazzdack,

I've looked at Bankrate - nothing, some other money markets compare their past rates to a LIpper money market average, but I can't find anything else about the Lipper . . . Thanks for posting
 
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