Cincinnati Bengals : biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1987 -> 1988     0.483   (0.267 -> 0.750)
Decline:     1990 -> 1991    -0.375   (0.563 -> 0.188)
Last Year:   2024 -> 2025    -0.176   (0.529 -> 0.353)