Frequencies for first 10,000 rows of pct012n031 variable in sf12000860us29 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,257       92.57       92.57
          1 |        461        4.61       97.18
          2 |        121        1.21       98.39
          3 |         54        0.54       98.93
          4 |         33        0.33       99.26
          5 |         30        0.30       99.56
          6 |         15        0.15       99.71
          7 |          7        0.07       99.78
          8 |          1        0.01       99.79
          9 |          2        0.02       99.81
         10 |          1        0.01       99.82
         11 |          4        0.04       99.86
         12 |          3        0.03       99.89
         14 |          1        0.01       99.90
         16 |          2        0.02       99.92
         17 |          1        0.01       99.93
         18 |          2        0.02       99.95
         20 |          1        0.01       99.96
         23 |          1        0.01       99.97
         24 |          1        0.01       99.98
         40 |          1        0.01       99.99
         45 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017