Frequencies for first 10,000 rows of pct0200025 variable in sf12010860us18 dataset :

   Military |
ships (602) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,989       99.89       99.89
         27 |          1        0.01       99.90
         29 |          1        0.01       99.91
         73 |          1        0.01       99.92
         76 |          1        0.01       99.93
        183 |          1        0.01       99.94
        207 |          1        0.01       99.95
        249 |          1        0.01       99.96
        454 |          1        0.01       99.97
        994 |          1        0.01       99.98
       1362 |          1        0.01       99.99
      19279 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017