Frequencies for first 10,000 rows of pct020h030 variable in sf12010860us38 dataset :

Maritime/me |
     rchant |
    vessels |
      (900) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,985       99.85       99.85
          1 |          4        0.04       99.89
          2 |          1        0.01       99.90
          3 |          3        0.03       99.93
          4 |          2        0.02       99.95
          5 |          2        0.02       99.97
          6 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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