Frequencies for first 10,000 rows of pct012m180 variable in sf12000860us28 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,957       99.57       99.57
          1 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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