Frequencies for first 10,000 rows of pct012c135 variable in sf12010860us22 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,492       84.92       84.92
          1 |        882        8.82       93.74
          2 |        312        3.12       96.86
          3 |        131        1.31       98.17
          4 |         76        0.76       98.93
          5 |         30        0.30       99.23
          6 |         20        0.20       99.43
          7 |         15        0.15       99.58
          8 |          9        0.09       99.67
          9 |          6        0.06       99.73
         10 |          9        0.09       99.82
         11 |          2        0.02       99.84
         13 |          1        0.01       99.85
         14 |          1        0.01       99.86
         19 |          2        0.02       99.88
         20 |          1        0.01       99.89
         21 |          1        0.01       99.90
         22 |          1        0.01       99.91
         24 |          1        0.01       99.92
         27 |          1        0.01       99.93
         28 |          1        0.01       99.94
         30 |          1        0.01       99.95
         41 |          1        0.01       99.96
         45 |          1        0.01       99.97
         63 |          1        0.01       99.98
         65 |          1        0.01       99.99
         72 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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