Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-K KEY PERFORMANCE FACTORS January 31, 1999 Expected B Maturity 11/17/03 Blended Coupon 5.1819% Excess Protection Level 3 Month Average 5.77% January, 1999 5.77% December, 1998 5.83% November, 1998 5.70% Cash Yield 18.21% Investor Charge Offs 4.95% Base Rate 7.49% Over 35 Day Delinquency 5.29% Seller's Interest 8.19% Total Payment Rate 14.12% Total Principal Balance $40,086,865,639.98 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $3,284,946,121.49