Frequencies for first 10,000 rows of pct012m045 variable in sf12000860us28 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,789       97.89       97.89
          1 |        196        1.96       99.85
          2 |         13        0.13       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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