Frequencies for first 10,000 rows of pct012c031 variable in sf12000860us18 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,548       85.48       85.48
          1 |        941        9.41       94.89
          2 |        276        2.76       97.65
          3 |        108        1.08       98.73
          4 |         52        0.52       99.25
          5 |         25        0.25       99.50
          6 |         14        0.14       99.64
          7 |         11        0.11       99.75
          8 |          8        0.08       99.83
          9 |          1        0.01       99.84
         10 |          1        0.01       99.85
         11 |          1        0.01       99.86
         13 |          1        0.01       99.87
         14 |          1        0.01       99.88
         16 |          2        0.02       99.90
         20 |          2        0.02       99.92
         22 |          1        0.01       99.93
         30 |          1        0.01       99.94
         34 |          1        0.01       99.95
         35 |          1        0.01       99.96
         59 |          1        0.01       99.97
         62 |          1        0.01       99.98
         73 |          1        0.01       99.99
         79 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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