Washington Nationals 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      8      1      0     44.7     652   805
 1990s:    10      0      1      9      0      0     50.0     776   777
 1980s:    10      0      0     10      0      0     51.9     811   752
 1970s:    10      0      0      9      1      0     46.5     748   862
 1960s:     1      0      0      0      1      0     32.1      52   110
Totals:    40      0      1     36      3      0     47.9    3039  3306


Playoff appearances per decade:

                   World   Yrs in   League    Div.
                  Series    World   Champ.   Champ.     In
          Yrs.     Wins    Series   Series   Series  Playoffs
 2000s:     9        0        0        0        0        0
 1990s:    10        0        0        0        0        0
 1980s:    10        0        0        1        1        1
 1970s:    10        0        0        0        0        0
 1960s:     1        0        0        0        0        0
Totals:    40        0        0        1        1        1