Denver Nuggets biggest year-to-year improvement/decline
based on regular season win percentage:

                            Change in 
                              win %
Improvement: 2003 -> 2004     0.317   (0.207 -> 0.524)
Decline:     1990 -> 1991    -0.280   (0.524 -> 0.244)
Last Year:   2007 -> 2008     0.061   (0.549 -> 0.610)