Frequencies for first 10,000 rows of pct012m177 variable in sf12010880us32 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,952       99.52       99.52
          1 |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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