Exhibit 99.18 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-K KEY PERFORMANCE FACTORS December 31, 1999 Expected B Maturity 11/17/03 Blended Coupon 6.6442% Excess Protection Level 3 Month Average 5.54% December, 1999 4.62% November, 1999 5.83% October, 1999 6.19% Cash Yield 19.14% Investor Charge Offs 5.04% Base Rate 9.48% Over 30 Day Delinquency 4.63% Seller's Interest 11.35% Total Payment Rate 14.35% Total Principal Balance $49,947,826,881.37 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $5,671,007,362.88