Frequencies for first 10,000 rows of pct012n177 variable in sf12000860us29 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,752       97.52       97.52
          1 |        193        1.93       99.45
          2 |         30        0.30       99.75
          3 |         10        0.10       99.85
          4 |          9        0.09       99.94
          5 |          1        0.01       99.95
          7 |          2        0.02       99.97
          8 |          1        0.01       99.98
          9 |          1        0.01       99.99
         19 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017