Miami Dolphins : biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2007 -> 2008     0.625   (0.063 -> 0.688)
Decline:     2003 -> 2004    -0.375   (0.625 -> 0.250)
Last Year:   2022 -> 2023     0.118   (0.529 -> 0.647)