Frequencies for first 10,000 rows of pct012m030 variable in sf12010880us32 dataset :

   27 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,803       98.03       98.03
          1 |        175        1.75       99.78
          2 |         17        0.17       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017