Frequencies for first 10,000 rows of pct012k027 variable in sf12010880us30 dataset :

   24 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,215       92.15       92.15
          1 |        589        5.89       98.04
          2 |        125        1.25       99.29
          3 |         39        0.39       99.68
          4 |         14        0.14       99.82
          5 |          9        0.09       99.91
          6 |          3        0.03       99.94
          7 |          2        0.02       99.96
          8 |          1        0.01       99.97
         10 |          1        0.01       99.98
         11 |          1        0.01       99.99
         26 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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