Frequencies for first 10,000 rows of pct012k003 variable in sf12010880us30 dataset :

    Under 1 |
       year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,289       92.89       92.89
          1 |        528        5.28       98.17
          2 |        104        1.04       99.21
          3 |         50        0.50       99.71
          4 |         15        0.15       99.86
          5 |          4        0.04       99.90
          6 |          4        0.04       99.94
          9 |          2        0.02       99.96
         10 |          1        0.01       99.97
         11 |          1        0.01       99.98
         12 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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