Philadelphia 76ers biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2017 -> 2018     0.293   (0.341 -> 0.634)
Decline:     1950 -> 1951    -0.312   (0.797 -> 0.485)
Last Year:   2024 -> 2025    -0.280   (0.573 -> 0.293)