Frequencies for first 10,000 rows of pct012c177 variable in sf12000860us18 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,522       95.22       95.22
          1 |        387        3.87       99.09
          2 |         56        0.56       99.65
          3 |         12        0.12       99.77
          4 |          8        0.08       99.85
          5 |          5        0.05       99.90
          6 |          1        0.01       99.91
          7 |          3        0.03       99.94
          8 |          2        0.02       99.96
         14 |          1        0.01       99.97
         19 |          1        0.01       99.98
         25 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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