Exhibit 99.40 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-L KEY PERFORMANCE FACTORS January 31, 2001 Expected B Maturity 10/16/06 Blended Coupon 6.2158% Excess Protection Level 3 Month Average 4.43% January, 2001 6.80% December, 2000 0.14% November, 2000 6.33% Cash Yield19.75% Investor Charge Offs 4.73% Base Rate 8.22% Over 30 Day Delinquency 4.88% Seller's Interest11.58% Total Payment Rate14.47% Total Principal Balance$57,905,967,832.59 Investor Participation Amount$750,000,000.00 Seller Participation Amount$6,705,277,271.10