Frequencies for first 10,000 rows of pct012c132 variable in sf12000860us18 dataset :

   25 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,675       86.75       86.75
          1 |        896        8.96       95.71
          2 |        226        2.26       97.97
          3 |        104        1.04       99.01
          4 |         43        0.43       99.44
          5 |         18        0.18       99.62
          6 |          7        0.07       99.69
          7 |          6        0.06       99.75
          8 |          4        0.04       99.79
          9 |          3        0.03       99.82
         10 |          2        0.02       99.84
         12 |          1        0.01       99.85
         13 |          3        0.03       99.88
         15 |          2        0.02       99.90
         16 |          1        0.01       99.91
         17 |          1        0.01       99.92
         21 |          1        0.01       99.93
         24 |          1        0.01       99.94
         30 |          1        0.01       99.95
         32 |          1        0.01       99.96
         60 |          1        0.01       99.97
         62 |          1        0.01       99.98
         71 |          1        0.01       99.99
         89 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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