Frequencies for first 10,000 rows of pct012k174 variable in sf12010880us30 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,477       94.77       94.77
          1 |        453        4.53       99.30
          2 |         50        0.50       99.80
          3 |         13        0.13       99.93
          4 |          3        0.03       99.96
          5 |          1        0.01       99.97
          7 |          1        0.01       99.98
          8 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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