New York Giants : biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1966 -> 1967     0.393   (0.107 -> 0.500)
Decline:     2016 -> 2017    -0.500   (0.688 -> 0.188)
Last Year:   2024 -> 2025     0.059   (0.176 -> 0.235)