Boston Red Sox : win % / playoff appearances 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
 2020s:     6      0      0      6      0      0     50.8     442   428
 2010s:    10      0      1      9      0      0     53.8     872   748
 2000s:    10      0      1      9      0      0     56.8     920   699
 1990s:    10      0      0     10      0      0     52.3     814   741
 1980s:    10      0      0     10      0      0     52.5     821   742
 1970s:    10      0      2      8      0      0     55.6     895   714
 1960s:    10      0      0      9      1      0     47.5     764   845
 1950s:    10      0      1      9      0      0     52.9     814   725
 1940s:    10      0      4      6      0      0     55.6     854   683
 1930s:    10      0      0      8      2      0     46.4     705   815
 1920s:    10      0      0      4      6      0     38.8     595   938
 1910s:    10      0      2      8      0      0     57.9     857   624
 1900s:     7      0      2      3      2      0     50.9     535   517
Totals:   123      0     13     99     11      0     51.8    9888  9219


Playoff appearances per decade:

                   World   Yrs in   League    Div.
                  Series    World   Champ.   Champ.     In
          Yrs.     Wins    Series   Series   Series  Playoffs
 2020s:     6        0        0        1        1        2
 2010s:    10        2        2        2        4        4
 2000s:    10        2        2        4        6        6
 1990s:    10        0        0        2        3        4
 1980s:    10        0        1        2        0        2
 1970s:    10        0        1        1        0        1
 1960s:    10        0        1        0        0        1
 1950s:    10        0        0        0        0        0
 1940s:    10        0        1        0        0        1
 1930s:    10        0        0        0        0        0
 1920s:    10        0        0        0        0        0
 1910s:    10        4        4        0        0        4
 1900s:     7        1        1        0        0        1
Totals:   123        9       13       12       14       26