Frequencies for first 10,000 rows of pct012m135 variable in sf12000860us28 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,774       97.74       97.74
          1 |        195        1.95       99.69
          2 |         25        0.25       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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