Frequencies for first 10,000 rows of pct012m158 variable in sf12000860us28 dataset :

   51 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,840       98.40       98.40
          1 |        149        1.49       99.89
          2 |         10        0.10       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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