I know this is irrelevant now but I have 3 receipts from 1983 and 1984 and the interest rates back then. I drool over them!
June 17, 1983, 30 month term certificate, 12.00% interest rate
June 01, 1984, 30 month term certificate, 12.55% interest rate
July 25, 1984, 18 month term certificate, 10.00% interest rate
I have no idea how much was deposited into these certificates. It just lists an account number.