New York Yankees 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      3      6      0      0     59.3     862   592
 1990s:    10      0      3      7      0      0     54.8     851   702
 1980s:    10      0      2      8      0      0     54.7     854   708
 1970s:    10      0      3      7      0      0     55.5     892   715
 1960s:    10      0      4      6      0      0     55.2     887   720
 1950s:    10      0      8      2      0      0     62.1     955   582
 1940s:    10      0      6      4      0      0     60.4     929   609
 1930s:    10      0      8      2      0      0     63.6     970   554
 1920s:    10      0      6      4      0      0     60.8     933   602
 1910s:    10      0      0      8      2      0     47.3     701   780
 1900s:     7      0      1      5      1      0     50.1     520   518
Totals:   106      0     44     59      3      0     56.9    9354  7082


Playoff appearances per decade:

                   World   Yrs in   League    Div.
                  Series    World   Champ.   Champ.     In
          Yrs.     Wins    Series   Series   Series  Playoffs
 2000s:     9        1        3        4        8        8
 1990s:    10        3        3        3        5        5
 1980s:    10        0        1        2        1        2
 1970s:    10        2        3        3        0        3
 1960s:    10        2        5        0        0        5
 1950s:    10        6        8        0        0        8
 1940s:    10        4        5        0        0        5
 1930s:    10        5        5        0        0        5
 1920s:    10        3        6        0        0        6
 1910s:    10        0        0        0        0        0
 1900s:     7        0        0        0        0        0
Totals:   106       26       39       12       14       47