Frequencies for first 10,000 rows of pct012m072 variable in sf12000860us28 dataset :

   69 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,961       99.61       99.61
          1 |         37        0.37       99.98
          2 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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