Frequencies for first 10,000 rows of pct012m180 variable in sf12010880us32 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,969       99.69       99.69
          1 |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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