Frequencies for first 10,000 rows of pct012m156 variable in sf12000860us28 dataset :

   49 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,878       98.78       98.78
          1 |        115        1.15       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 , 17 Apr 2017