Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-L KEY PERFORMANCE FACTORS FEBRUARY, 1999 Expected B Maturity 12/15/99 Blended Coupon 5.0752% Excess Protection Level 3 Month Average 5.91% February, 1999 6.12% January, 1999 5.53% December, 1998 6.08% Cash Yield 17.82% Investor Charge Offs 5.13% Base Rate 6.58% Over 35 Day Delinquency 5.38% Seller's Interest 9.80% Total Payment Rate 13.67% Total Principal Balance $ 40,800,539,305.60 Investor Participation Amount $ 500,000,000.00 Seller Participation Amount $ 3,998,619,787.11