Dallas Mavericks biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1994 -> 1995     0.280   (0.159 -> 0.439)
Decline:     1990 -> 1991    -0.232   (0.573 -> 0.341)
Last Year:   2025 -> 2026    -0.159   (0.476 -> 0.317)