Frequencies for first 10,000 rows of p012c009 variable in sf12010860us7 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,281       82.81       82.81
          1 |      1,001       10.01       92.82
          2 |        330        3.30       96.12
          3 |        151        1.51       97.63
          4 |         71        0.71       98.34
          5 |         49        0.49       98.83
          6 |         30        0.30       99.13
          7 |         26        0.26       99.39
          8 |         12        0.12       99.51
          9 |          8        0.08       99.59
         10 |          9        0.09       99.68
         11 |          7        0.07       99.75
         12 |          4        0.04       99.79
         13 |          1        0.01       99.80
         14 |          3        0.03       99.83
         15 |          3        0.03       99.86
         16 |          1        0.01       99.87
         18 |          1        0.01       99.88
         21 |          1        0.01       99.89
         23 |          1        0.01       99.90
         30 |          1        0.01       99.91
         31 |          1        0.01       99.92
         33 |          2        0.02       99.94
         38 |          1        0.01       99.95
         39 |          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