Exhibit 99.21 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS January 31, 2000 Expected B Maturity 3/15/04 Blended Coupon 5.9423% Excess Protection Level 3 Month Average 5.31% January, 2000 5.42% December, 1999 4.65% November, 1999 5.85% Cash Yield 17.74% Investor Charge Offs 4.73% Base Rate 7.59% Over 30 Day Delinquency 5.03% Seller's Interest 9.78% Total Payment Rate 14.21% Total Principal Balance $49,077,414,912.07 Investor Participation Amount $750,000,000.00 Seller Participation Amount $4,800,914,393.58