Frequencies for first 10,000 rows of pct012c030 variable in sf12000860us18 dataset :

   27 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,580       85.80       85.80
          1 |        909        9.09       94.89
          2 |        274        2.74       97.63
          3 |        107        1.07       98.70
          4 |         45        0.45       99.15
          5 |         25        0.25       99.40
          6 |         18        0.18       99.58
          7 |         13        0.13       99.71
          8 |          8        0.08       99.79
          9 |          1        0.01       99.80
         10 |          5        0.05       99.85
         11 |          2        0.02       99.87
         12 |          1        0.01       99.88
         13 |          1        0.01       99.89
         17 |          1        0.01       99.90
         20 |          1        0.01       99.91
         23 |          1        0.01       99.92
         24 |          1        0.01       99.93
         32 |          1        0.01       99.94
         36 |          1        0.01       99.95
         45 |          1        0.01       99.96
         55 |          1        0.01       99.97
         59 |          1        0.01       99.98
         71 |          1        0.01       99.99
         93 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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