Exhibit 99.43 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-I KEY PERFORMANCE FACTORS March 31, 2000 Expected B Maturity 08/15/2002 Blended Coupon 6.4825% Excess Protection Level 3 Month Average 5.73% March, 2000 5.89% February, 2000 6.04% January, 2000 5.25% Cash Yield19.39% Investor Charge Offs 4.70% Base Rate 8.81% Over 30 Day Delinquency 4.65% Seller's Interest 8.73% Total Payment Rate15.20% Total Principal Balance$49,480,326,758.32 Investor Participation Amount$750,000,000.00 Seller Participation Amount$4,321,526,239.83