Frequencies for first 10,000 rows of pct012c066 variable in sf12000860us18 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,349       93.49       93.49
          1 |        549        5.49       98.98
          2 |         64        0.64       99.62
          3 |         14        0.14       99.76
          4 |          8        0.08       99.84
          5 |          5        0.05       99.89
          6 |          3        0.03       99.92
          8 |          1        0.01       99.93
          9 |          1        0.01       99.94
         12 |          2        0.02       99.96
         14 |          1        0.01       99.97
         21 |          1        0.01       99.98
         22 |          1        0.01       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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