New Orleans Pelicans biggest year-to-year improvement/decline

Based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2005 -> 2006     0.243   (0.220 -> 0.463)
Decline:     2004 -> 2005    -0.280   (0.500 -> 0.220)
Last Year:   2017 -> 2018     0.170   (0.415 -> 0.585)