Frequencies for first 10,000 rows of pct012m160 variable in sf12000860us28 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,891       98.91       98.91
          1 |        104        1.04       99.95
          2 |          4        0.04       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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