Frequencies for first 10,000 rows of pct012c071 variable in sf12000860us18 dataset :

   68 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,542       95.42       95.42
          1 |        388        3.88       99.30
          2 |         45        0.45       99.75
          3 |          8        0.08       99.83
          4 |          5        0.05       99.88
          5 |          2        0.02       99.90
          6 |          3        0.03       99.93
          7 |          2        0.02       99.95
          8 |          1        0.01       99.96
          9 |          1        0.01       99.97
         10 |          1        0.01       99.98
         21 |          1        0.01       99.99
         28 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017