Frequencies for first 10,000 rows of pct012c147 variable in sf12010860us22 dataset :

   40 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,353       83.53       83.53
          1 |      1,040       10.40       93.93
          2 |        322        3.22       97.15
          3 |        121        1.21       98.36
          4 |         61        0.61       98.97
          5 |         32        0.32       99.29
          6 |         19        0.19       99.48
          7 |         14        0.14       99.62
          8 |         10        0.10       99.72
          9 |          5        0.05       99.77
         10 |          2        0.02       99.79
         11 |          3        0.03       99.82
         12 |          5        0.05       99.87
         13 |          2        0.02       99.89
         20 |          1        0.01       99.90
         22 |          2        0.02       99.92
         31 |          2        0.02       99.94
         43 |          1        0.01       99.95
         46 |          1        0.01       99.96
         53 |          1        0.01       99.97
         59 |          1        0.01       99.98
         67 |          1        0.01       99.99
         69 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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