Frequencies for first 10,000 rows of pct020i030 variable in sf12010860us38 dataset :

Maritime/me |
     rchant |
    vessels |
      (900) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,982       99.82       99.82
          2 |          1        0.01       99.83
          3 |          3        0.03       99.86
          4 |          2        0.02       99.88
          7 |          1        0.01       99.89
          8 |          1        0.01       99.90
         10 |          1        0.01       99.91
         11 |          1        0.01       99.92
         14 |          2        0.02       99.94
         17 |          1        0.01       99.95
         19 |          1        0.01       99.96
         21 |          1        0.01       99.97
         22 |          2        0.02       99.99
         37 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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