Frequencies for first 10,000 rows of pct012m144 variable in sf12000860us28 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,775       97.75       97.75
          1 |        200        2.00       99.75
          2 |         22        0.22       99.97
          3 |          1        0.01       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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