Frequencies for first 10,000 rows of pct012k039 variable in sf12010860us30 dataset :

   36 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,962       89.62       89.62
          1 |        789        7.89       97.51
          2 |        155        1.55       99.06
          3 |         44        0.44       99.50
          4 |         17        0.17       99.67
          5 |          7        0.07       99.74
          6 |          8        0.08       99.82
          7 |          3        0.03       99.85
          8 |          1        0.01       99.86
          9 |          3        0.03       99.89
         10 |          1        0.01       99.90
         16 |          1        0.01       99.91
         18 |          2        0.02       99.93
         20 |          1        0.01       99.94
         26 |          1        0.01       99.95
         27 |          1        0.01       99.96
         47 |          1        0.01       99.97
         59 |          1        0.01       99.98
         63 |          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