Frequencies for first 10,000 rows of pct012c040 variable in sf12010860us22 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,382       83.82       83.82
          1 |      1,024       10.24       94.06
          2 |        320        3.20       97.26
          3 |        113        1.13       98.39
          4 |         59        0.59       98.98
          5 |         35        0.35       99.33
          6 |         16        0.16       99.49
          7 |         17        0.17       99.66
          8 |          7        0.07       99.73
          9 |          5        0.05       99.78
         10 |          4        0.04       99.82
         11 |          2        0.02       99.84
         12 |          2        0.02       99.86
         13 |          1        0.01       99.87
         14 |          1        0.01       99.88
         19 |          1        0.01       99.89
         22 |          1        0.01       99.90
         23 |          1        0.01       99.91
         25 |          1        0.01       99.92
         29 |          2        0.02       99.94
         33 |          1        0.01       99.95
         38 |          1        0.01       99.96
         41 |          1        0.01       99.97
         58 |          1        0.01       99.98
         76 |          1        0.01       99.99
         87 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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