Washington Wizards biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1968 -> 1969     0.256   (0.439 -> 0.695)
Decline:     2008 -> 2009    -0.292   (0.524 -> 0.232)
Last Year:   2025 -> 2026    -0.013   (0.220 -> 0.207)