Chicago Bulls win percentages per decade: The number of seasons
with win % in the following ranges:
                                                    Decade
          Yrs.    80%+ 60-79% 40-59% 20-39% 0-19%    Ave.    Wins Losses
 2000s:     9      0      0      4      4      1     37.4     276   462
 1990s:    10      3      5      1      1      0     70.8     558   230
 1980s:    10      0      1      5      4      0     45.0     369   451
 1970s:    10      0      4      4      2      0     53.4     438   382
 1960s:     3      0      0      2      1      0     38.8      95   150
Totals:    42      3     10     16     12      1     50.9    1736  1675

Per decade, the number of appearances in 
each playoff round:
                                    Yrs in    Yrs in   Yrs in
                  Finals   Yrs in   Conf.     Conf.    Round    Yrs in
          Yrs.     Wins    Finals   Finals    Semis    of 16   Playoffs
 2000s:     9        0        0        0        1        3        3
 1990s:    10        6        6        7        9        9        9
 1980s:    10        0        0        1        3        6        6
 1970s:    10        0        0        2        6        1        7
 1960s:     3        0        0        0        2        0        2
Totals:    42        6        6       10       21       19       27