Frequencies for first 10,000 rows of pct020d030 variable in sf12010860us37 dataset :

Maritime/me |
     rchant |
    vessels |
      (900) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,991       99.91       99.91
          1 |          1        0.01       99.92
          2 |          4        0.04       99.96
          6 |          1        0.01       99.97
         10 |          1        0.01       99.98
         11 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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