Frequencies for first 10,000 rows of pct012l090 variable in sf12000860us27 dataset :

   87 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,657       96.57       96.57
          1 |        263        2.63       99.20
          2 |         52        0.52       99.72
          3 |         11        0.11       99.83
          4 |          5        0.05       99.88
          5 |          4        0.04       99.92
          6 |          1        0.01       99.93
          8 |          1        0.01       99.94
          9 |          1        0.01       99.95
         11 |          1        0.01       99.96
         13 |          1        0.01       99.97
         14 |          1        0.01       99.98
         20 |          1        0.01       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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