Frequencies for first 10,000 rows of pct012m047 variable in sf12000860us28 dataset :

   44 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,795       97.95       97.95
          1 |        192        1.92       99.87
          2 |         12        0.12       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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