Frequencies for first 10,000 rows of pct012m151 variable in sf12000860us28 dataset :

   44 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,807       98.07       98.07
          1 |        180        1.80       99.87
          2 |         11        0.11       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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