Atlanta Hawks biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2020 -> 2021     0.270   (0.299 -> 0.569)
Decline:     1961 -> 1962    -0.283   (0.646 -> 0.363)
Last Year:   2025 -> 2026     0.073   (0.488 -> 0.561)