Frequencies for first 10,000 rows of pct012m042 variable in sf12000860us28 dataset :

   39 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,794       97.94       97.94
          1 |        191        1.91       99.85
          2 |         14        0.14       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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