Frequencies for first 10,000 rows of pct012m140 variable in sf12000860us28 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,799       97.99       97.99
          1 |        187        1.87       99.86
          2 |         10        0.10       99.96
          3 |          3        0.03       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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