Frequencies for first 10,000 rows of pct012k190 variable in sf12000860us26 dataset :

   83 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,806       98.06       98.06
          1 |        165        1.65       99.71
          2 |         21        0.21       99.92
          3 |          1        0.01       99.93
          4 |          1        0.01       99.94
          5 |          2        0.02       99.96
          6 |          1        0.01       99.97
          7 |          2        0.02       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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