Exhibit 99.43 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-I KEY PERFORMANCE FACTORS January 31, 2000 Expected B Maturity 08/15/2002 Blended Coupon 6.4825% Excess Protection Level 3 Month Average 5.20% January, 2000 5.25% December, 1999 4.68% November, 1999 5.67% Cash Yield17.74% Investor Charge Offs 4.73% Base Rate 7.76% Over 30 Day Delinquency 5.03% Seller's Interest 9.78% Total Payment Rate14.21% Total Principal Balance$49,077,414,912.07 Investor Participation Amount$750,000,000.00 Seller Participation Amount$4,800,914,393.58