Frequencies for first 10,000 rows of pct012k074 variable in sf12000860us26 dataset :

   71 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,668       96.68       96.68
          1 |        279        2.79       99.47
          2 |         38        0.38       99.85
          3 |          3        0.03       99.88
          4 |          3        0.03       99.91
          5 |          1        0.01       99.92
          7 |          1        0.01       99.93
          8 |          1        0.01       99.94
         10 |          3        0.03       99.97
         12 |          1        0.01       99.98
         17 |          1        0.01       99.99
         21 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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