When the amount of such compensation is not paid or deposited on or before taking possession of the land, the Collector shall pay the amount awarded with interest thereon at the rate of nine per cent. per annum from the time of so taking possession until it shall have been so paid or deposited:

   Provided that if such compensation or any part thereof is not paid or deposited within a period of one year from the date on which possession is taken, interest at the rate of fifteen per cent. per annum shall be payable from the date or expiry of the said period of one year on the amount of compensation or part thereof which has not been paid or deposited before the date of such expiry.