Exhibit 99.40 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-L KEY PERFORMANCE FACTORS December 31, 2000 Expected B Maturity 10/16/06 Blended Coupon 7.0433% Excess Protection Level 3 Month Average 4.21% December, 2000 0.14% November, 2000 6.33% October, 2000 6.16% Cash Yield19.79% Investor Charge Offs10.15% Base Rate 9.51% Over 30 Day Delinquency 4.72% Seller's Interest10.47% Total Payment Rate13.35% Total Principal Balance$57,190,978,436.47 Investor Participation Amount$750,000,000.00 Seller Participation Amount$5,990,287,874.98