(a) The Borrower agrees to pay to each Lender (which is not a Defaulting Lender), through the Administrative Agent, on the last Business Day of March, June, September and December in each year and on each date on which the Revolving Credit Commitment of such Lender shall expire or be terminated as provided herein, a commitment fee (a “ Commitment Fee ”) equal to 0.375% per annum on the daily unused amount of the Revolving Credit Commitment of such Lender during the preceding quarter (or shorter period commencing with the date hereof or ending with the Revolving Credit Maturity Date or the date on which the Revolving Credit Commitment of such Lender shall expire or be terminated). All Commitment Fees shall be computed on the basis of the actual number of days elapsed in a year of 360 days. For purposes of calculating Commitment Fees only, no portion of the Revolving Credit Commitments shall be deemed utilized as a result of outstanding Swingline Loans unless and until a Mandatory Borrowing is effected in connection therewith in accordance with Section  2.22(e) .