Seattle Mariners : 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:     7      0      0      7      0      0     52.9     546   486
 2010s:    10      0      0      9      1      0     46.8     758   862
 2000s:    10      0      1      7      2      0     51.7     837   783
 1990s:    10      0      0      9      1      0     49.3     764   787
 1980s:    10      0      0      8      2      0     43.0     673   893
 1970s:     3      0      0      1      2      0     38.6     187   297
Totals:    50      0      1     41      8      0     47.8    3765  4108


Playoff appearances per decade:

                   World   Yrs in   League    Div.
                  Series    World   Champ.   Champ.     In
          Yrs.     Wins    Series   Series   Series  Playoffs
 2020s:     7        0        0        1        2        2
 2010s:    10        0        0        0        0        0
 2000s:    10        0        0        2        2        2
 1990s:    10        0        0        1        2        2
 1980s:    10        0        0        0        0        0
 1970s:     3        0        0        0        0        0
Totals:    50        0        0        4        6        6