Frequencies for first 10,000 rows of pct012c023 variable in sf12010860us22 dataset :

   20 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,285       82.85       82.85
          1 |        987        9.87       92.72
          2 |        319        3.19       95.91
          3 |        159        1.59       97.50
          4 |         83        0.83       98.33
          5 |         47        0.47       98.80
          6 |         45        0.45       99.25
          7 |         13        0.13       99.38
          8 |         15        0.15       99.53
          9 |          9        0.09       99.62
         10 |          8        0.08       99.70
         11 |          2        0.02       99.72
         12 |          4        0.04       99.76
         13 |          3        0.03       99.79
         14 |          3        0.03       99.82
         15 |          1        0.01       99.83
         16 |          1        0.01       99.84
         17 |          2        0.02       99.86
         19 |          2        0.02       99.88
         21 |          1        0.01       99.89
         23 |          1        0.01       99.90
         28 |          1        0.01       99.91
         32 |          1        0.01       99.92
         33 |          1        0.01       99.93
         36 |          1        0.01       99.94
         39 |          1        0.01       99.95
         47 |          1        0.01       99.96
         58 |          1        0.01       99.97
         61 |          1        0.01       99.98
         69 |          1        0.01       99.99
         73 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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