Frequencies for first 10,000 rows of pct012c076 variable in sf12000860us18 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,688       96.88       96.88
          1 |        270        2.70       99.58
          2 |         28        0.28       99.86
          3 |          5        0.05       99.91
          4 |          1        0.01       99.92
          5 |          2        0.02       99.94
          6 |          2        0.02       99.96
          8 |          2        0.02       99.98
         11 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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