Milwaukee Bucks biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1969 -> 1970     0.354   (0.329 -> 0.683)
Decline:     2013 -> 2014    -0.280   (0.463 -> 0.183)
Last Year:   2019 -> 2020     0.035   (0.732 -> 0.767)