Exhibit 99.20 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-K KEY PERFORMANCE FACTORS April 30, 1999 Expected B Maturity 11/17/03 Blended Coupon 5.1082% Excess Protection Level 3 Month Average 6.00% April, 1999 5.18% March, 1999 6.74% February, 1999 6.08% Cash Yield 17.83% Investor Charge Offs 5.23% Base Rate 7.42% Over 35 Day Delinquency 4.87% Seller's Interest 10.40% Total Payment Rate 14.17% Total Principal Balance $42,469,994,217.25 Investor Participation Amount $1,000,000,000.00 Seller Participation Amount $4,418,074,698.76