Exhibit 99.20 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS June 30, 2000 Expected B Maturity 3/15/04 Blended Coupon 6.8121% Excess Protection Level 3 Month Average 5.39% June, 2000 4.96% May, 2000 5.69% April, 2000 5.51% Cash Yield 18.75% Investor Charge Offs 4.56% Base Rate 9.23% Over 30 Day Delinquency 4.60% Seller's Interest 12.05% Total Payment Rate 14.03% Total Principal Balance $54,839,173,315.51 Investor Participation Amount $750,000,000.00 Seller Participation Amount $6,607,972,797.02