Frequencies for first 10,000 rows of pct012k155 variable in sf12010860us30 dataset :

   48 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,651       86.51       86.51
          1 |        960        9.60       96.11
          2 |        251        2.51       98.62
          3 |         70        0.70       99.32
          4 |         28        0.28       99.60
          5 |         10        0.10       99.70
          6 |          6        0.06       99.76
          7 |          1        0.01       99.77
          8 |          4        0.04       99.81
          9 |          3        0.03       99.84
         11 |          3        0.03       99.87
         12 |          3        0.03       99.90
         17 |          1        0.01       99.91
         19 |          1        0.01       99.92
         27 |          1        0.01       99.93
         32 |          1        0.01       99.94
         35 |          1        0.01       99.95
         37 |          2        0.02       99.97
         60 |          1        0.01       99.98
         68 |          1        0.01       99.99
         90 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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