Frequencies for first 10,000 rows of pct012l091 variable in sf12000860us27 dataset :

   88 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,719       97.19       97.19
          1 |        205        2.05       99.24
          2 |         43        0.43       99.67
          3 |         18        0.18       99.85
          4 |          2        0.02       99.87
          5 |          4        0.04       99.91
          6 |          4        0.04       99.95
          7 |          1        0.01       99.96
          9 |          1        0.01       99.97
         11 |          1        0.01       99.98
         12 |          1        0.01       99.99
         28 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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