Frequencies for first 10,000 rows of pct012m038 variable in sf12000860us28 dataset :

   35 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,746       97.46       97.46
          1 |        237        2.37       99.83
          2 |         15        0.15       99.98
          3 |          1        0.01       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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