Frequencies for first 10,000 rows of pct012c170 variable in sf12000860us18 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,351       93.51       93.51
          1 |        517        5.17       98.68
          2 |         84        0.84       99.52
          3 |         25        0.25       99.77
          4 |         10        0.10       99.87
          5 |          2        0.02       99.89
          6 |          4        0.04       99.93
         11 |          2        0.02       99.95
         15 |          1        0.01       99.96
         19 |          1        0.01       99.97
         27 |          1        0.01       99.98
         29 |          1        0.01       99.99
         30 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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