Brooklyn Nets biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2001 -> 2002     0.317   (0.317 -> 0.634)
Decline:     2009 -> 2010    -0.269   (0.415 -> 0.146)
Last Year:   2019 -> 2020    -0.026   (0.512 -> 0.486)