Green Bay Packers : biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2018 -> 2019     0.407   (0.406 -> 0.813)
Decline:     2007 -> 2008    -0.438   (0.813 -> 0.375)
Last Year:   2022 -> 2023     0.058   (0.471 -> 0.529)