Frequencies for first 10,000 rows of pct012e054 variable in sf12010880us24 dataset :

   51 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,841       98.41       98.41
          1 |        150        1.50       99.91
          2 |          7        0.07       99.98
          3 |          1        0.01       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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