Frequencies for first 10,000 rows of pct012k140 variable in sf12010860us30 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,986       89.86       89.86
          1 |        729        7.29       97.15
          2 |        184        1.84       98.99
          3 |         54        0.54       99.53
          4 |         15        0.15       99.68
          5 |          7        0.07       99.75
          6 |          6        0.06       99.81
          7 |          1        0.01       99.82
          8 |          3        0.03       99.85
         12 |          1        0.01       99.86
         13 |          2        0.02       99.88
         18 |          1        0.01       99.89
         20 |          1        0.01       99.90
         21 |          1        0.01       99.91
         23 |          1        0.01       99.92
         24 |          1        0.01       99.93
         34 |          1        0.01       99.94
         40 |          1        0.01       99.95
         43 |          1        0.01       99.96
         52 |          1        0.01       99.97
         60 |          1        0.01       99.98
         61 |          1        0.01       99.99
         77 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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