Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-L KEY PERFORMANCE FACTORS MARCH, 1998 Expected B Maturity 12/15/99 Blended Coupon 5.7088% Excess Protection Level 3 Month Average 5.15% March, 1998 5.97% February, 1998 4.76% January, 1998 4.71% Cash Yield 18.56% Investor Charge Offs 4.85% Base Rate 7.74% Over 35 Day Delinquency 5.06% Seller's Interest 11.41% Total Payment Rate 13.80% Total Principal Balance $ 33,909,306,783.29 Investor Participation Amount $ 500,000,000.00 Seller Participation Amount $ 3,867,972,264.80