Frequencies for first 10,000 rows of pct012k046 variable in sf12010880us30 dataset :

   43 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,119       91.19       91.19
          1 |        685        6.85       98.04
          2 |        145        1.45       99.49
          3 |         28        0.28       99.77
          4 |         13        0.13       99.90
          5 |          4        0.04       99.94
          6 |          2        0.02       99.96
          7 |          1        0.01       99.97
          9 |          1        0.01       99.98
         11 |          1        0.01       99.99
         17 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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