Frequencies for first 10,000 rows of pct012m150 variable in sf12000860us28 dataset :

   43 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,797       97.97       97.97
          1 |        189        1.89       99.86
          2 |         13        0.13       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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