Exhibit 99.25 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-I KEY PERFORMANCE FACTORS September 30, 1999 Expected B Maturity 8/16/04 Blended Coupon 6.4465% Excess Protection Level 3 Month Average 5.98% September, 1999 5.88% August, 1999 5.99% July, 1999 6.08% Cash Yield18.00% Investor Charge Offs 4.60% Base Rate 7.52% Over 30 Day Delinquency 4.90% Seller's Interest 6.99% Total Payment Rate14.16% Total Principal Balance$45,780,732,257.76 Investor Participation Amount$750,000,000.00 Seller Participation Amount$3,198,912,739.27