Excel formulas to calculate logrithmic values

I need a simple excel tool to help develop rating system values based on logarithmic function.
I have attached an excel file in which the ratings are from 5 to 1, the value of 1000 if for rating 5, and I need to insert formulas to derive values for ratings 2-4.
Who is Participating?
Saqib Husain, SyedConnect With a Mentor EngineerCommented:
Saqib Husain, SyedEngineerCommented:
Enter this in B2 and copy down

gh_userAuthor Commented:
Thanks Saqib.  I need the difference in values to reduce as the ratings reduce.
eg 5 - 1000
     4 - 569
     3 - 317
     2 - 138
     1 - 0
gh_userAuthor Commented:
Thanks for the quick response
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