Pittsburgh Steelers : biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2003 -> 2004     0.563   (0.375 -> 0.938)
Decline:     2002 -> 2003    -0.281   (0.656 -> 0.375)
Last Year:   2022 -> 2023     0.059   (0.529 -> 0.588)