Chicago Bulls biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1995 -> 1996     0.305   (0.573 -> 0.878)
Decline:     1998 -> 1999    -0.496   (0.756 -> 0.260)
Last Year:   2016 -> 2017    -0.012   (0.512 -> 0.500)