Frequencies for first 10,000 rows of pct012k141 variable in sf12010880us30 dataset :

   34 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,311       93.11       93.11
          1 |        538        5.38       98.49
          2 |         97        0.97       99.46
          3 |         31        0.31       99.77
          4 |         14        0.14       99.91
          5 |          5        0.05       99.96
          6 |          2        0.02       99.98
          7 |          1        0.01       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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