Biggest declines
                                          Change in
    All Time:                               win %
  1 New York Rangers       1942 -> 1943    -0.325   (0.625 -> 0.300)
  2 Toronto Maple Leafs    1918 -> 1919    -0.313   (0.591 -> 0.278)
  3 St. Louis Blues        2004 -> 2006    -0.287   (0.543 -> 0.256)
  4 Philadelphia Flyers    2006 -> 2007    -0.281   (0.549 -> 0.268)
  4 Montreal Canadiens     1925 -> 1926    -0.281   (0.600 -> 0.319)
  6 Chicago Blackhawks     1927 -> 1928    -0.273   (0.466 -> 0.193)
  7 Detroit Red Wings      1970 -> 1971    -0.272   (0.625 -> 0.353)
  7 Chicago Blackhawks     1953 -> 1954    -0.272   (0.493 -> 0.221)
  9 Boston Bruins          1931 -> 1932    -0.267   (0.705 -> 0.438)
 10 Detroit Red Wings      1937 -> 1938    -0.250   (0.615 -> 0.365)
 11 Boston Bruins          2004 -> 2006    -0.238   (0.591 -> 0.353)
 12 Phoenix Coyotes        1985 -> 1986    -0.231   (0.600 -> 0.369)
 13 Detroit Red Wings      1996 -> 1997    -0.226   (0.799 -> 0.573)
 14 Montreal Canadiens     1947 -> 1948    -0.225   (0.650 -> 0.425)
 14 Los Angeles Kings      1981 -> 1982    -0.225   (0.619 -> 0.394)
 14 Chicago Blackhawks     1983 -> 1984    -0.225   (0.650 -> 0.425)
 17 St. Louis Blues        1981 -> 1982    -0.219   (0.669 -> 0.450)
 18 Florida Panthers       2000 -> 2001    -0.213   (0.561 -> 0.348)
 19 New York Rangers       1984 -> 1985    -0.193   (0.581 -> 0.388)
 20 Montreal Canadiens     1945 -> 1946    -0.190   (0.800 -> 0.610)
 21 San Jose Sharks        2002 -> 2003    -0.189   (0.585 -> 0.396)
 21 Carolina Hurricanes    2002 -> 2003    -0.189   (0.524 -> 0.335)
 23 Pittsburgh Penguins    1982 -> 1983    -0.188   (0.469 -> 0.281)
 24 Colorado Avalanche     1989 -> 1990    -0.187   (0.381 -> 0.194)
 25 New York Rangers       1992 -> 1993    -0.186   (0.656 -> 0.470)

    Last season:
    Buffalo Sabres         2007 -> 2008    -0.170   (0.646 -> 0.476)
    Tampa Bay Lightning    2007 -> 2008    -0.159   (0.537 -> 0.378)
    Vancouver Canucks      2007 -> 2008    -0.122   (0.598 -> 0.476)
    Nashville Predators    2007 -> 2008    -0.122   (0.622 -> 0.500)
    Atlanta Thrashers      2007 -> 2008    -0.109   (0.524 -> 0.415)
    Ottawa Senators        2007 -> 2008    -0.061   (0.585 -> 0.524)
    New York Islanders     2007 -> 2008    -0.061   (0.488 -> 0.427)
    Dallas Stars           2007 -> 2008    -0.061   (0.610 -> 0.549)
    Toronto Maple Leafs    2007 -> 2008    -0.049   (0.488 -> 0.439)
    Minnesota Wild         2007 -> 2008    -0.048   (0.585 -> 0.537)
    New Jersey Devils      2007 -> 2008    -0.037   (0.598 -> 0.561)
    San Jose Sharks        2007 -> 2008    -0.024   (0.622 -> 0.598)
    St. Louis Blues        2007 -> 2008    -0.013   (0.415 -> 0.402)
    Calgary Flames         2007 -> 2008    -0.012   (0.524 -> 0.512)
    Anaheim Ducks          2007 -> 2008    -0.012   (0.585 -> 0.573)