Frequencies for first 10,000 rows of pct012c174 variable in sf12000860us18 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,392       93.92       93.92
          1 |        495        4.95       98.87
          2 |         77        0.77       99.64
          3 |         18        0.18       99.82
          4 |          8        0.08       99.90
          5 |          1        0.01       99.91
          8 |          1        0.01       99.92
          9 |          1        0.01       99.93
         11 |          1        0.01       99.94
         12 |          1        0.01       99.95
         13 |          1        0.01       99.96
         14 |          2        0.02       99.98
         19 |          1        0.01       99.99
         46 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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