Frequencies for first 10,000 rows of pct013c009 variable in sf12000860us31 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,695       86.95       86.95
          1 |        863        8.63       95.58
          2 |        230        2.30       97.88
          3 |         89        0.89       98.77
          4 |         46        0.46       99.23
          5 |         22        0.22       99.45
          6 |         17        0.17       99.62
          7 |          9        0.09       99.71
          8 |          8        0.08       99.79
          9 |          4        0.04       99.83
         10 |          3        0.03       99.86
         11 |          1        0.01       99.87
         12 |          2        0.02       99.89
         13 |          1        0.01       99.90
         15 |          1        0.01       99.91
         20 |          1        0.01       99.92
         22 |          1        0.01       99.93
         32 |          1        0.01       99.94
         34 |          1        0.01       99.95
         35 |          1        0.01       99.96
         51 |          1        0.01       99.97
         53 |          1        0.01       99.98
         59 |          1        0.01       99.99
         69 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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