Frequencies for first 10,000 rows of pct012c056 variable in sf12000860us18 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,736       87.36       87.36
          1 |        966        9.66       97.02
          2 |        193        1.93       98.95
          3 |         61        0.61       99.56
          4 |         15        0.15       99.71
          5 |          9        0.09       99.80
          6 |          7        0.07       99.87
          7 |          1        0.01       99.88
         12 |          1        0.01       99.89
         14 |          1        0.01       99.90
         15 |          1        0.01       99.91
         17 |          1        0.01       99.92
         18 |          1        0.01       99.93
         22 |          2        0.02       99.95
         23 |          1        0.01       99.96
         30 |          1        0.01       99.97
         49 |          1        0.01       99.98
         50 |          1        0.01       99.99
         62 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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