Exhibit 99.45 MBNA MASTER CREDIT CARD TRUST II SERIES 1999-L KEY PERFORMANCE FACTORS December 31, 1999 Expected B Maturity 10/16/2006 Blended Coupon 6.7958% Excess Protection Level 3 Month Average 3.86% December, 1999 4.40% November, 1999 3.31% October, 1999 N/A Cash Yield19.14% Investor Charge Offs 5.04% Base Rate 9.70% Over 30 Day Delinquency 4.63% Seller's Interest11.35% Total Payment Rate14.35% Total Principal Balance$49,947,826,881.37 Investor Participation Amount$750,000,000.00 Seller Participation Amount$5,671,007,362.88