Frequencies for first 10,000 rows of pct012c042 variable in sf12000860us18 dataset :

   39 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,390       83.90       83.90
          1 |      1,119       11.19       95.09
          2 |        277        2.77       97.86
          3 |        112        1.12       98.98
          4 |         37        0.37       99.35
          5 |         18        0.18       99.53
          6 |         18        0.18       99.71
          7 |          6        0.06       99.77
          8 |          8        0.08       99.85
          9 |          1        0.01       99.86
         11 |          1        0.01       99.87
         12 |          1        0.01       99.88
         13 |          3        0.03       99.91
         19 |          1        0.01       99.92
         24 |          1        0.01       99.93
         26 |          1        0.01       99.94
         35 |          1        0.01       99.95
         36 |          1        0.01       99.96
         37 |          1        0.01       99.97
         53 |          1        0.01       99.98
         65 |          1        0.01       99.99
         68 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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