Frequencies for first 10,000 rows of pct012m174 variable in sf12000860us28 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,958       99.58       99.58
          1 |         40        0.40       99.98
          2 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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