Oklahoma City Thunder biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2009 -> 2010     0.330   (0.280 -> 0.610)
Decline:     2020 -> 2021    -0.305   (0.611 -> 0.306)
Last Year:   2021 -> 2022    -0.013   (0.306 -> 0.293)