Seattle Seahawks : biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2011 -> 2012     0.250   (0.438 -> 0.688)
Decline:     2007 -> 2008    -0.375   (0.625 -> 0.250)
Last Year:   2024 -> 2025     0.236   (0.588 -> 0.824)