Frequencies for first 10,000 rows of pct012k151 variable in sf12010880us30 dataset :

   44 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,067       90.67       90.67
          1 |        693        6.93       97.60
          2 |        164        1.64       99.24
          3 |         44        0.44       99.68
          4 |         17        0.17       99.85
          5 |          6        0.06       99.91
          6 |          2        0.02       99.93
          7 |          3        0.03       99.96
          9 |          2        0.02       99.98
         12 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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