Golden State Warriors biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2020 -> 2021     0.311   (0.231 -> 0.542)
Decline:     2019 -> 2020    -0.464   (0.695 -> 0.231)
Last Year:   2025 -> 2026    -0.134   (0.585 -> 0.451)