Seattle Storm biggest year-to-year improvement/decline
based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2001 -> 2002     0.218   (0.313 -> 0.531)
Decline:     2005 -> 2006    -0.059   (0.588 -> 0.529)
Last Year:   2006 -> 2007    -0.029   (0.529 -> 0.500)