NBA : Biggest year to year improvements from one season to the
next (based on regular season win percentage):
                                             Change in
       Franchise                               win %
  1 Boston Celtics            2007 -> 2008     0.512   (0.293 -> 0.805)
  2 San Antonio Spurs         1997 -> 1998     0.439   (0.244 -> 0.683)
  3 San Antonio Spurs         1989 -> 1990     0.427   (0.256 -> 0.683)
  4 Phoenix Suns              2004 -> 2005     0.402   (0.354 -> 0.756)
  5 Boston Celtics            1979 -> 1980     0.390   (0.354 -> 0.744)
  6 Milwaukee Bucks           1969 -> 1970     0.354   (0.329 -> 0.683)
  7 Miami Heat                2008 -> 2009     0.341   (0.183 -> 0.524)
  8 Oklahoma City Thunder     2009 -> 2010     0.330   (0.280 -> 0.610)
  8 Phoenix Suns              1988 -> 1989     0.330   (0.341 -> 0.671)
 10 Brooklyn Nets             2001 -> 2002     0.317   (0.317 -> 0.634)
 10 Denver Nuggets            2003 -> 2004     0.317   (0.207 -> 0.524)
 10 Milwaukee Bucks           2014 -> 2015     0.317   (0.183 -> 0.500)
 13 Golden State Warriors     2020 -> 2021     0.311   (0.231 -> 0.542)
 14 Chicago Bulls             1995 -> 1996     0.305   (0.573 -> 0.878)
 15 Chicago Bulls             2004 -> 2005     0.293   (0.280 -> 0.573)
 15 Cleveland Cavaliers       1991 -> 1992     0.293   (0.402 -> 0.695)
 15 Philadelphia 76ers        2017 -> 2018     0.293   (0.341 -> 0.634)
 18 Los Angeles Lakers        2019 -> 2020     0.281   (0.451 -> 0.732)
 18 Phoenix Suns              1969 -> 1970     0.281   (0.195 -> 0.476)
 20 Dallas Mavericks          1994 -> 1995     0.280   (0.159 -> 0.439)
 20 Golden State Warriors     1988 -> 1989     0.280   (0.244 -> 0.524)
 20 Phoenix Suns              2013 -> 2014     0.280   (0.305 -> 0.585)
 23 Atlanta Hawks             2020 -> 2021     0.270   (0.299 -> 0.569)
 24 Atlanta Hawks             2014 -> 2015     0.269   (0.463 -> 0.732)
 24 Memphis Grizzlies         2003 -> 2004     0.269   (0.341 -> 0.610)

    Last season:
    Houston Rockets           2023 -> 2024     0.232   (0.268 -> 0.500)
    Oklahoma City Thunder     2023 -> 2024     0.207   (0.488 -> 0.695)
    Minnesota Timberwolves    2023 -> 2024     0.171   (0.512 -> 0.683)
    Orlando Magic             2023 -> 2024     0.158   (0.415 -> 0.573)
    Dallas Mavericks          2023 -> 2024     0.147   (0.463 -> 0.610)
    Indiana Pacers            2023 -> 2024     0.146   (0.427 -> 0.573)
    New Orleans Pelicans      2023 -> 2024     0.086   (0.512 -> 0.598)
    Boston Celtics            2023 -> 2024     0.085   (0.695 -> 0.780)
    Los Angeles Clippers      2023 -> 2024     0.085   (0.537 -> 0.622)
    Denver Nuggets            2023 -> 2024     0.049   (0.646 -> 0.695)
    Los Angeles Lakers        2023 -> 2024     0.049   (0.524 -> 0.573)
    Phoenix Suns              2023 -> 2024     0.049   (0.549 -> 0.598)
    New York Knickerbockers   2023 -> 2024     0.037   (0.573 -> 0.610)
    Golden State Warriors     2023 -> 2024     0.024   (0.537 -> 0.561)
    Miami Heat                2023 -> 2024     0.024   (0.537 -> 0.561)