Frequencies for first 10,000 rows of pct020g025 variable in sf12010880us38 dataset :

   Military |
ships (602) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,991       99.91       99.91
          1 |          1        0.01       99.92
          2 |          1        0.01       99.93
          3 |          2        0.02       99.95
          6 |          1        0.01       99.96
         10 |          1        0.01       99.97
         35 |          1        0.01       99.98
         66 |          1        0.01       99.99
        720 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017