Frequencies for first 10,000 rows of pct012n147 variable in sf12000860us29 dataset :

   40 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,247       92.47       92.47
          1 |        494        4.94       97.41
          2 |        127        1.27       98.68
          3 |         54        0.54       99.22
          4 |         21        0.21       99.43
          5 |         11        0.11       99.54
          6 |          9        0.09       99.63
          7 |          8        0.08       99.71
          8 |          6        0.06       99.77
          9 |          3        0.03       99.80
         10 |          3        0.03       99.83
         11 |          2        0.02       99.85
         12 |          3        0.03       99.88
         13 |          2        0.02       99.90
         15 |          1        0.01       99.91
         17 |          1        0.01       99.92
         18 |          2        0.02       99.94
         22 |          1        0.01       99.95
         28 |          1        0.01       99.96
         30 |          1        0.01       99.97
         35 |          1        0.01       99.98
         40 |          1        0.01       99.99
         54 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017