Frequencies for first 10,000 rows of pct012c073 variable in sf12000860us18 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,590       95.90       95.90
          1 |        348        3.48       99.38
          2 |         38        0.38       99.76
          3 |         13        0.13       99.89
          4 |          2        0.02       99.91
          6 |          1        0.01       99.92
          7 |          2        0.02       99.94
          8 |          1        0.01       99.95
          9 |          2        0.02       99.97
         12 |          1        0.01       99.98
         14 |          1        0.01       99.99
         32 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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