Exhibit 99.25 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-E KEY PERFORMANCE FACTORS May 31, 1999 Expected B Maturity 4/15/02 Blended Coupon 5.1168% Excess Protection Level 3 Month Average 6.51% May, 1999 7.62% April, 1999 5.17% March, 1999 6.75% Cash Yield 19.47% Investor Charge Offs 4.88% Base Rate 6.97% Over 30 Day Delinquency 4.89% Seller's Interest 6.97% Total Payment Rate 14.69% Total Principal Balance $41,914,776,221.36 Investor Participation Amount $750,000,000.00 Seller Participation Amount $2,922,256,702.87