NBA : Biggest year to year declines from one season to the
next (based on regular season win percentage):
                                             Change in
       Franchise                               win %
  1 Cleveland Cavaliers       2010 -> 2011    -0.512   (0.744 -> 0.232)
  2 Chicago Bulls             1998 -> 1999    -0.496   (0.756 -> 0.260)
  3 San Antonio Spurs         1996 -> 1997    -0.476   (0.720 -> 0.244)
  4 Golden State Warriors     2019 -> 2020    -0.464   (0.695 -> 0.231)
  5 Houston Rockets           1982 -> 1983    -0.390   (0.561 -> 0.171)
  6 Golden State Warriors     1964 -> 1965    -0.387   (0.600 -> 0.213)
  7 Indiana Pacers            2025 -> 2026    -0.378   (0.610 -> 0.232)
  7 Cleveland Cavaliers       2018 -> 2019    -0.378   (0.610 -> 0.232)
  9 Houston Rockets           2020 -> 2021    -0.375   (0.611 -> 0.236)
 10 Toronto Raptors           2020 -> 2021    -0.361   (0.736 -> 0.375)
 11 Miami Heat                2007 -> 2008    -0.354   (0.537 -> 0.183)
 12 New Orleans Pelicans      2024 -> 2025    -0.342   (0.598 -> 0.256)
 13 Memphis Grizzlies         2006 -> 2007    -0.330   (0.598 -> 0.268)
 14 Golden State Warriors     1952 -> 1953    -0.326   (0.500 -> 0.174)
 15 Orlando Magic             2012 -> 2013    -0.317   (0.561 -> 0.244)
 15 Charlotte Hornets         2002 -> 2005    -0.317   (0.537 -> 0.220)
 17 Philadelphia 76ers        1950 -> 1951    -0.312   (0.797 -> 0.485)
 18 Charlotte Hornets         2011 -> 2012    -0.309   (0.415 -> 0.106)
 19 Oklahoma City Thunder     2020 -> 2021    -0.305   (0.611 -> 0.306)
 20 Memphis Grizzlies         2023 -> 2024    -0.293   (0.622 -> 0.329)
 20 Minnesota Timberwolves    2014 -> 2015    -0.293   (0.488 -> 0.195)
 20 Golden State Warriors     1994 -> 1995    -0.293   (0.610 -> 0.317)
 23 Washington Wizards        2008 -> 2009    -0.292   (0.524 -> 0.232)
 24 Atlanta Hawks             1961 -> 1962    -0.283   (0.646 -> 0.363)
 25 Memphis Grizzlies         2025 -> 2026    -0.280   (0.585 -> 0.305)
 25 Philadelphia 76ers        2024 -> 2025    -0.280   (0.573 -> 0.293)
 25 New York Knickerbockers   1984 -> 1985    -0.280   (0.573 -> 0.293)
 25 New Orleans Pelicans      2004 -> 2005    -0.280   (0.500 -> 0.220)
 25 Milwaukee Bucks           2013 -> 2014    -0.280   (0.463 -> 0.183)
 25 Denver Nuggets            1990 -> 1991    -0.280   (0.524 -> 0.244)
 25 Chicago Bulls             1975 -> 1976    -0.280   (0.573 -> 0.293)

    Last season:
    Indiana Pacers            2025 -> 2026    -0.378   (0.610 -> 0.232)
    Memphis Grizzlies         2025 -> 2026    -0.280   (0.585 -> 0.305)
    Sacramento Kings          2025 -> 2026    -0.220   (0.488 -> 0.268)
    Milwaukee Bucks           2025 -> 2026    -0.195   (0.585 -> 0.390)
    Dallas Mavericks          2025 -> 2026    -0.159   (0.476 -> 0.317)
    Cleveland Cavaliers       2025 -> 2026    -0.146   (0.780 -> 0.634)
    Golden State Warriors     2025 -> 2026    -0.134   (0.585 -> 0.451)
    Los Angeles Clippers      2025 -> 2026    -0.098   (0.610 -> 0.512)
    Chicago Bulls             2025 -> 2026    -0.098   (0.476 -> 0.378)
    Brooklyn Nets             2025 -> 2026    -0.073   (0.317 -> 0.244)
    Boston Celtics            2025 -> 2026    -0.061   (0.744 -> 0.683)
    Oklahoma City Thunder     2025 -> 2026    -0.049   (0.829 -> 0.780)
    Washington Wizards        2025 -> 2026    -0.013   (0.220 -> 0.207)