Frequencies for first 10,000 rows of pct012c128 variable in sf12010860us22 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,437       84.37       84.37
          1 |        937        9.37       93.74
          2 |        300        3.00       96.74
          3 |        140        1.40       98.14
          4 |         66        0.66       98.80
          5 |         38        0.38       99.18
          6 |         17        0.17       99.35
          7 |         21        0.21       99.56
          8 |          8        0.08       99.64
          9 |          7        0.07       99.71
         10 |          5        0.05       99.76
         11 |          6        0.06       99.82
         12 |          2        0.02       99.84
         14 |          1        0.01       99.85
         16 |          1        0.01       99.86
         17 |          1        0.01       99.87
         18 |          2        0.02       99.89
         22 |          1        0.01       99.90
         24 |          2        0.02       99.92
         26 |          1        0.01       99.93
         42 |          1        0.01       99.94
         43 |          1        0.01       99.95
         45 |          2        0.02       99.97
         59 |          1        0.01       99.98
         61 |          1        0.01       99.99
         80 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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