Frequencies for first 10,000 rows of pct012c144 variable in sf12000860us18 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,463       84.63       84.63
          1 |      1,029       10.29       94.92
          2 |        270        2.70       97.62
          3 |        107        1.07       98.69
          4 |         62        0.62       99.31
          5 |         24        0.24       99.55
          6 |         13        0.13       99.68
          7 |          5        0.05       99.73
          8 |          5        0.05       99.78
          9 |          2        0.02       99.80
         10 |          4        0.04       99.84
         12 |          2        0.02       99.86
         14 |          3        0.03       99.89
         17 |          1        0.01       99.90
         19 |          1        0.01       99.91
         25 |          1        0.01       99.92
         27 |          1        0.01       99.93
         30 |          1        0.01       99.94
         35 |          1        0.01       99.95
         45 |          2        0.02       99.97
         51 |          1        0.01       99.98
         73 |          1        0.01       99.99
         76 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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