Frequencies for first 10,000 rows of pct012n072 variable in sf12000860us29 dataset :

   69 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,820       98.20       98.20
          1 |        145        1.45       99.65
          2 |         19        0.19       99.84
          3 |          8        0.08       99.92
          4 |          2        0.02       99.94
          5 |          1        0.01       99.95
          6 |          1        0.01       99.96
          7 |          1        0.01       99.97
          8 |          1        0.01       99.98
         12 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017