Washington Wizards biggest year-to-year improvement/decline
based on regular season win percentage:

                            Change in 
                              win %
Improvement: 1968 -> 1969     0.256   (0.439 -> 0.695)
Decline:     1966 -> 1967    -0.228   (0.475 -> 0.247)
Last Year:   2007 -> 2008     0.024   (0.500 -> 0.524)