Frequencies for first 10,000 rows of pct012c175 variable in sf12000860us18 dataset :

   68 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,485       94.85       94.85
          1 |        425        4.25       99.10
          2 |         57        0.57       99.67
          3 |         17        0.17       99.84
          4 |          4        0.04       99.88
          5 |          1        0.01       99.89
          6 |          1        0.01       99.90
          7 |          2        0.02       99.92
          8 |          2        0.02       99.94
         10 |          1        0.01       99.95
         11 |          1        0.01       99.96
         14 |          1        0.01       99.97
         16 |          1        0.01       99.98
         23 |          1        0.01       99.99
         27 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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