Biggest improvements
                                          Change in
    All Time:                               win %
  1 San Jose Sharks        1993 -> 1994     0.346   (0.143 -> 0.489)
  2 Montreal Canadiens     1926 -> 1927     0.340   (0.319 -> 0.659)
  3 Montreal Canadiens     1943 -> 1944     0.330   (0.500 -> 0.830)
  4 Boston Bruins          1925 -> 1926     0.328   (0.200 -> 0.528)
  5 Pittsburgh Penguins    2006 -> 2007     0.305   (0.268 -> 0.573)
  6 Phoenix Coyotes        1981 -> 1982     0.300   (0.200 -> 0.500)
  7 Colorado Avalanche     1992 -> 1993     0.294   (0.325 -> 0.619)
  8 Chicago Blackhawks     1929 -> 1930     0.284   (0.250 -> 0.534)
  9 New York Islanders     2001 -> 2002     0.262   (0.299 -> 0.561)
 10 Boston Bruins          1967 -> 1968     0.254   (0.314 -> 0.568)
 11 Philadelphia Flyers    2007 -> 2008     0.244   (0.268 -> 0.512)
 12 Buffalo Sabres         1972 -> 1973     0.237   (0.327 -> 0.564)
 12 Detroit Red Wings      1986 -> 1987     0.237   (0.250 -> 0.487)
 14 Dallas Stars           1996 -> 1997     0.232   (0.402 -> 0.634)
 15 Detroit Red Wings      1977 -> 1978     0.231   (0.256 -> 0.487)
 15 Edmonton Oilers        1981 -> 1982     0.231   (0.463 -> 0.694)
 17 Boston Bruins          1929 -> 1930     0.227   (0.648 -> 0.875)
 18 Colorado Avalanche     1994 -> 1995     0.225   (0.452 -> 0.677)
 19 Ottawa Senators        1996 -> 1997     0.220   (0.250 -> 0.470)
 20 Buffalo Sabres         1974 -> 1975     0.219   (0.487 -> 0.706)
 21 Montreal Canadiens     1936 -> 1937     0.218   (0.344 -> 0.562)
 22 Chicago Blackhawks     1939 -> 1940     0.209   (0.333 -> 0.542)
 23 Carolina Hurricanes    2004 -> 2006     0.207   (0.427 -> 0.634)
 24 San Jose Sharks        2003 -> 2004     0.202   (0.396 -> 0.598)
 25 Boston Bruins          1945 -> 1946     0.200   (0.360 -> 0.560)
 25 Chicago Blackhawks     1945 -> 1946     0.200   (0.330 -> 0.530)
 25 Chicago Blackhawks     1982 -> 1983     0.200   (0.450 -> 0.650)
 25 St. Louis Blues        1979 -> 1980     0.200   (0.300 -> 0.500)

    Last season:
    Philadelphia Flyers    2007 -> 2008     0.244   (0.268 -> 0.512)
    Washington Capitals    2007 -> 2008     0.183   (0.341 -> 0.524)
    Edmonton Oilers        2007 -> 2008     0.110   (0.390 -> 0.500)
    Chicago Blackhawks     2007 -> 2008     0.109   (0.378 -> 0.487)
    Phoenix Coyotes        2007 -> 2008     0.085   (0.378 -> 0.463)
    Boston Bruins          2007 -> 2008     0.073   (0.427 -> 0.500)
    Los Angeles Kings      2007 -> 2008     0.061   (0.329 -> 0.390)
    Montreal Canadiens     2007 -> 2008     0.061   (0.512 -> 0.573)
    Detroit Red Wings      2007 -> 2008     0.049   (0.610 -> 0.659)
    Carolina Hurricanes    2007 -> 2008     0.036   (0.488 -> 0.524)
    Florida Panthers       2007 -> 2008     0.036   (0.427 -> 0.463)
    Columbus Blue Jackets  2007 -> 2008     0.013   (0.402 -> 0.415)