Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-L KEY PERFORMANCE FACTORS JULY, 1998 Expected B Maturity 12/15/99 Blended Coupon 5.7679% Excess Protection Level 3 Month Average 5.05% July, 1998 5.36% June, 1998 4.79% May, 1998 5.00% Cash Yield 18.81% Investor Charge Offs 5.14% Base Rate 8.31% Over 35 Day Delinquency 4.90% Seller's Interest 15.22% Total Payment Rate 14.52% Total Principal Balance $ 37,740,921,726.81 Investor Participation Amount $ 500,000,000.00 Seller Participation Amount $ 5,743,527,208.32