I need to know year wise ppf interest rate starting from 98 financial year.?

Interest amount is getting added every year in my ppf account. I doubt the interest they have deposited is correct. I want to calculate this and then want to go to bank and thus need to know PPF interest for all finacncial years starting from 1997~98 FY. Or please share the rate chart and change date table.
Thanks

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ppf interest rates year wise