Frequencies for first 10,000 rows of pct013c009 variable in sf12010860us35 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,447       84.47       84.47
          1 |        920        9.20       93.67
          2 |        305        3.05       96.72
          3 |        120        1.20       97.92
          4 |         69        0.69       98.61
          5 |         36        0.36       98.97
          6 |         30        0.30       99.27
          7 |         20        0.20       99.47
          8 |          9        0.09       99.56
          9 |          8        0.08       99.64
         10 |          6        0.06       99.70
         11 |          8        0.08       99.78
         12 |          4        0.04       99.82
         13 |          1        0.01       99.83
         14 |          3        0.03       99.86
         15 |          3        0.03       99.89
         18 |          1        0.01       99.90
         21 |          1        0.01       99.91
         31 |          1        0.01       99.92
         33 |          3        0.03       99.95
         38 |          1        0.01       99.96
         51 |          2        0.02       99.98
         52 |          1        0.01       99.99
         61 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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