(3) of section 21-64 , shall pay interest on each security deposit received by such landlord at a rate of not less than the average rate paid, as of December 30, 1992, on savings deposits by insured commercial banks as published in the Federal Reserve Board Bulletin rounded to the nearest one-tenth of one percentage point, except in no event shall the rate be less than one and one-half per cent. On and after January 1, 1994, the rate for each calendar year shall be not less than the deposit index, determined under this section as it was in effect during such year. On and after January 1, 2012, the rate for each calendar year shall be not less than the deposit index, as defined in section 36a-26 , for that year. On the anniversary date of the tenancy and annually thereafter, such interest shall be paid to the tenant or resident or credited toward the next rental payment due from the tenant or resident, as the landlord or owner shall determine. If the tenancy is terminated before the anniversary date of such tenancy, or if the landlord or owner returns all or part of a security deposit prior to termination of the tenancy, the landlord or owner shall pay the accrued interest to the tenant or resident not later than twenty-one days after such termination or return. Interest shall not be paid to a tenant for any month in which the tenant has been delinquent for more than ten days in the payment of any monthly rent, unless the landlord imposes a late charge for such delinquency. No landlord shall increase the rent due from a tenant because of the requirement that the landlord pay on interest the security deposit.