Frequencies for first 10,000 rows of pct012k174 variable in sf12010860us30 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,258       92.58       92.58
          1 |        608        6.08       98.66
          2 |         85        0.85       99.51
          3 |         22        0.22       99.73
          4 |          8        0.08       99.81
          5 |          3        0.03       99.84
          6 |          1        0.01       99.85
          7 |          3        0.03       99.88
          8 |          1        0.01       99.89
          9 |          1        0.01       99.90
         11 |          1        0.01       99.91
         13 |          1        0.01       99.92
         14 |          2        0.02       99.94
         15 |          1        0.01       99.95
         16 |          1        0.01       99.96
         17 |          1        0.01       99.97
         26 |          1        0.01       99.98
         32 |          1        0.01       99.99
         42 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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