Frequencies for first 10,000 rows of pct012m022 variable in sf12000860us28 dataset :

   19 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,719       97.19       97.19
          1 |        231        2.31       99.50
          2 |         30        0.30       99.80
          3 |          7        0.07       99.87
          4 |          8        0.08       99.95
          5 |          1        0.01       99.96
          6 |          1        0.01       99.97
          7 |          1        0.01       99.98
          8 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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