Frequencies for first 10,000 rows of pct012m050 variable in sf12010880us32 dataset :

   47 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,840       98.40       98.40
          1 |        153        1.53       99.93
          2 |          6        0.06       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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