Frequencies for first 10,000 rows of pct012k075 variable in sf12000860us26 dataset :

   72 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,689       96.89       96.89
          1 |        265        2.65       99.54
          2 |         30        0.30       99.84
          3 |          8        0.08       99.92
          4 |          1        0.01       99.93
          7 |          1        0.01       99.94
          8 |          1        0.01       99.95
         10 |          1        0.01       99.96
         12 |          2        0.02       99.98
         15 |          1        0.01       99.99
         20 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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