It was in 1998, I beleive...
from buffalobills.com...
10/4 San Francisco 49ers W 26-21 76,615
10/11 @ Indianapolis Colts W 31-24 52,938
10/18 Jacksonville Jaguars W 17-16 77,635
10/25 @ Carolina Panthers W 30-14 64,050
11/1 Miami Dolphins W 30-24 79,011