Frequencies for first 10,000 rows of pct012k045 variable in sf12010860us30 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,851       88.51       88.51
          1 |        865        8.65       97.16
          2 |        178        1.78       98.94
          3 |         56        0.56       99.50
          4 |         23        0.23       99.73
          5 |          3        0.03       99.76
          6 |          5        0.05       99.81
          7 |          2        0.02       99.83
          8 |          2        0.02       99.85
          9 |          1        0.01       99.86
         10 |          1        0.01       99.87
         11 |          1        0.01       99.88
         12 |          1        0.01       99.89
         13 |          1        0.01       99.90
         14 |          1        0.01       99.91
         17 |          1        0.01       99.92
         20 |          1        0.01       99.93
         21 |          1        0.01       99.94
         26 |          1        0.01       99.95
         31 |          1        0.01       99.96
         49 |          1        0.01       99.97
         55 |          1        0.01       99.98
         58 |          1        0.01       99.99
         60 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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