Exhibit 99.13 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-B KEY PERFORMANCE FACTORS July 31, 1999 Expected B Maturity 4/17/06 Blended Coupon 5.4853% Excess Protection Level 3 Month Average 6.17% July, 1999 5.88% June, 1999 5.08% May, 1999 7.54% Cash Yield 18.70% Investor Charge Offs 4.97% Base Rate 7.85% Over 30 Day Delinquency 4.84% Seller's Interest 9.75% Total Payment Rate 14.54% Total Principal Balance $45,698,903,036.29 Investor Participation Amount $500,000,000.00 Seller Participation Amount $4,456,383,517.80