Frequencies for first 10,000 rows of pct012n180 variable in sf12000860us29 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,800       98.00       98.00
          1 |        153        1.53       99.53
          2 |         28        0.28       99.81
          3 |          4        0.04       99.85
          4 |          4        0.04       99.89
          5 |          3        0.03       99.92
          6 |          2        0.02       99.94
          7 |          2        0.02       99.96
          8 |          1        0.01       99.97
          9 |          1        0.01       99.98
         10 |          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