Frequencies for first 10,000 rows of pct012n073 variable in sf12000860us29 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,820       98.20       98.20
          1 |        139        1.39       99.59
          2 |         24        0.24       99.83
          3 |          7        0.07       99.90
          4 |          6        0.06       99.96
          5 |          1        0.01       99.97
          6 |          1        0.01       99.98
          9 |          1        0.01       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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