Frequencies for first 10,000 rows of pct013c021 variable in sf12000860us31 dataset :

   67 to 69 |
      years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,875       88.75       88.75
          1 |        841        8.41       97.16
          2 |        171        1.71       98.87
          3 |         44        0.44       99.31
          4 |         27        0.27       99.58
          5 |         12        0.12       99.70
          6 |         10        0.10       99.80
          7 |          2        0.02       99.82
          8 |          3        0.03       99.85
          9 |          2        0.02       99.87
         10 |          1        0.01       99.88
         11 |          1        0.01       99.89
         13 |          2        0.02       99.91
         18 |          1        0.01       99.92
         20 |          1        0.01       99.93
         22 |          1        0.01       99.94
         26 |          3        0.03       99.97
         37 |          1        0.01       99.98
         39 |          1        0.01       99.99
         77 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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