Frequencies for first 10,000 rows of pct012c179 variable in sf12000860us18 dataset :

   72 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,555       95.55       95.55
          1 |        363        3.63       99.18
          2 |         51        0.51       99.69
          3 |         12        0.12       99.81
          4 |          6        0.06       99.87
          5 |          3        0.03       99.90
          6 |          1        0.01       99.91
          7 |          1        0.01       99.92
          8 |          1        0.01       99.93
          9 |          1        0.01       99.94
         10 |          2        0.02       99.96
         11 |          1        0.01       99.97
         15 |          1        0.01       99.98
         16 |          1        0.01       99.99
         29 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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