Frequencies for first 10,000 rows of pct012k180 variable in sf12010860us30 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,547       95.47       95.47
          1 |        378        3.78       99.25
          2 |         50        0.50       99.75
          3 |          9        0.09       99.84
          4 |          1        0.01       99.85
          5 |          2        0.02       99.87
          6 |          2        0.02       99.89
          8 |          3        0.03       99.92
          9 |          2        0.02       99.94
         10 |          1        0.01       99.95
         14 |          1        0.01       99.96
         20 |          1        0.01       99.97
         22 |          1        0.01       99.98
         25 |          1        0.01       99.99
         26 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017