Frequencies for first 10,000 rows of pct012e180 variable in sf12010880us24 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,961       99.61       99.61
          1 |         38        0.38       99.99
          2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017