Frequencies for first 10,000 rows of pct012c036 variable in sf12000860us18 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,540       85.40       85.40
          1 |        961        9.61       95.01
          2 |        283        2.83       97.84
          3 |        105        1.05       98.89
          4 |         41        0.41       99.30
          5 |         18        0.18       99.48
          6 |         19        0.19       99.67
          7 |          6        0.06       99.73
          8 |          5        0.05       99.78
          9 |          6        0.06       99.84
         10 |          2        0.02       99.86
         12 |          2        0.02       99.88
         13 |          1        0.01       99.89
         14 |          1        0.01       99.90
         15 |          1        0.01       99.91
         18 |          1        0.01       99.92
         22 |          1        0.01       99.93
         23 |          1        0.01       99.94
         27 |          1        0.01       99.95
         33 |          1        0.01       99.96
         49 |          1        0.01       99.97
         52 |          1        0.01       99.98
         54 |          1        0.01       99.99
         70 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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