Frequencies for first 10,000 rows of pct012k154 variable in sf12010880us30 dataset :

   47 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,037       90.37       90.37
          1 |        719        7.19       97.56
          2 |        165        1.65       99.21
          3 |         46        0.46       99.67
          4 |         22        0.22       99.89
          5 |          4        0.04       99.93
          6 |          3        0.03       99.96
          9 |          1        0.01       99.97
         10 |          1        0.01       99.98
         15 |          1        0.01       99.99
         19 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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