Exhibit 99.13 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-B KEY PERFORMANCE FACTORS August 31, 1999 Expected B Maturity 4/17/06 Blended Coupon 5.5740% Excess Protection Level 3 Month Average 5.61% August, 1999 5.86% July, 1999 5.88% June, 1999 5.08% Cash Yield 18.20% Investor Charge Offs 4.78% Base Rate 7.57% Over 30 Day Delinquency 4.81% Seller's Interest 7.19% Total Payment Rate 14.37% Total Principal Balance $46,158,397,644.87 Investor Participation Amount $500,000,000.00 Seller Participation Amount $3,316,578,126.38