Frequencies for first 10,000 rows of pct012c042 variable in sf12010860us22 dataset :

   39 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,293       82.93       82.93
          1 |      1,050       10.50       93.43
          2 |        343        3.43       96.86
          3 |        138        1.38       98.24
          4 |         74        0.74       98.98
          5 |         31        0.31       99.29
          6 |         26        0.26       99.55
          7 |         15        0.15       99.70
          8 |          7        0.07       99.77
          9 |          6        0.06       99.83
         10 |          2        0.02       99.85
         12 |          2        0.02       99.87
         14 |          2        0.02       99.89
         17 |          1        0.01       99.90
         20 |          2        0.02       99.92
         21 |          1        0.01       99.93
         24 |          1        0.01       99.94
         35 |          1        0.01       99.95
         43 |          2        0.02       99.97
         60 |          1        0.01       99.98
         71 |          1        0.01       99.99
         72 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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