Exhibit 99.45 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-L KEY PERFORMANCE FACTORS March 31, 2000 Expected B Maturity 10/16/06 Blended Coupon 6.3370% Excess Protection Level 3 Month Average 5.69% March, 2000 5.73% February, 2000 6.04% January, 2000 5.30% Cash Yield19.39% Investor Charge Offs 4.70% Base Rate 8.97% 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