Frequencies for first 10,000 rows of pct012c158 variable in sf12010860us22 dataset :

   51 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,307       83.07       83.07
          1 |      1,117       11.17       94.24
          2 |        334        3.34       97.58
          3 |        120        1.20       98.78
          4 |         59        0.59       99.37
          5 |         21        0.21       99.58
          6 |         12        0.12       99.70
          7 |          8        0.08       99.78
          8 |          7        0.07       99.85
         12 |          1        0.01       99.86
         14 |          1        0.01       99.87
         15 |          1        0.01       99.88
         16 |          2        0.02       99.90
         20 |          1        0.01       99.91
         21 |          1        0.01       99.92
         23 |          1        0.01       99.93
         29 |          1        0.01       99.94
         39 |          1        0.01       99.95
         42 |          1        0.01       99.96
         50 |          1        0.01       99.97
         57 |          1        0.01       99.98
         71 |          1        0.01       99.99
         74 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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