Frequencies for first 10,000 rows of pct012n070 variable in sf12000860us29 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,782       97.82       97.82
          1 |        174        1.74       99.56
          2 |         30        0.30       99.86
          3 |          6        0.06       99.92
          4 |          1        0.01       99.93
          5 |          2        0.02       99.95
          6 |          3        0.03       99.98
          8 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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