on the 4.25% ( 4.25 % ) notes due in 2021 ( 201c2021 notes 201d ) is payable semi-annually on may 24 and november 24 of each year , which commenced november 24 , 2011 , and is approximately $ 32 million per year . the 2021 notes may be redeemed prior to maturity at any time in whole or in part at the option of the company at a 201cmake-whole 201d redemption price . the 2021 notes were issued at a discount of $ 4 million