Frequencies for first 10,000 rows of pct012m024 variable in sf12000860us28 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,704       97.04       97.04
          1 |        237        2.37       99.41
          2 |         43        0.43       99.84
          3 |          7        0.07       99.91
          4 |          5        0.05       99.96
          5 |          3        0.03       99.99
         19 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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