Exhibit 99.22 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-E KEY PERFORMANCE FACTORS December 31, 1999 Expected B Maturity 4/15/02 Blended Coupon 6.3231% Excess Protection Level 3 Month Average 5.25% December, 1999 5.05% November, 1999 5.20% October, 1999 5.51% Cash Yield 19.20% Investor Charge Offs 5.04% Base Rate 9.11% 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 $750,000,000.00 Seller Participation Amount $5,671,007,362.88