Frequencies for first 10,000 rows of pct012k073 variable in sf12010860us30 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,484       94.84       94.84
          1 |        434        4.34       99.18
          2 |         53        0.53       99.71
          3 |         15        0.15       99.86
          4 |          2        0.02       99.88
          5 |          2        0.02       99.90
          6 |          1        0.01       99.91
          7 |          2        0.02       99.93
          8 |          1        0.01       99.94
         11 |          1        0.01       99.95
         12 |          1        0.01       99.96
         16 |          1        0.01       99.97
         26 |          2        0.02       99.99
         29 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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