Frequencies for first 10,000 rows of pct012c033 variable in sf12000860us18 dataset :

   30 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,487       84.87       84.87
          1 |        968        9.68       94.55
          2 |        298        2.98       97.53
          3 |        106        1.06       98.59
          4 |         45        0.45       99.04
          5 |         37        0.37       99.41
          6 |         17        0.17       99.58
          7 |         13        0.13       99.71
          8 |          7        0.07       99.78
          9 |          4        0.04       99.82
         10 |          1        0.01       99.83
         11 |          4        0.04       99.87
         12 |          1        0.01       99.88
         13 |          1        0.01       99.89
         16 |          1        0.01       99.90
         19 |          1        0.01       99.91
         22 |          1        0.01       99.92
         24 |          1        0.01       99.93
         25 |          2        0.02       99.95
         39 |          1        0.01       99.96
         46 |          1        0.01       99.97
         60 |          1        0.01       99.98
         65 |          1        0.01       99.99
         67 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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