Cleveland Cavaliers biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1991 -> 1992     0.293   (0.402 -> 0.695)
Decline:     2010 -> 2011    -0.512   (0.744 -> 0.232)
Last Year:   2025 -> 2026    -0.146   (0.780 -> 0.634)