Frequencies for first 10,000 rows of pct012o056 variable in sf12000860us30 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,684       76.84       76.84
          1 |      1,299       12.99       89.83
          2 |        460        4.60       94.43
          3 |        210        2.10       96.53
          4 |        113        1.13       97.66
          5 |         65        0.65       98.31
          6 |         53        0.53       98.84
          7 |         26        0.26       99.10
          8 |         18        0.18       99.28
          9 |         23        0.23       99.51
         10 |          9        0.09       99.60
         11 |          4        0.04       99.64
         12 |          8        0.08       99.72
         13 |          6        0.06       99.78
         14 |          4        0.04       99.82
         15 |          3        0.03       99.85
         16 |          3        0.03       99.88
         17 |          2        0.02       99.90
         18 |          2        0.02       99.92
         19 |          3        0.03       99.95
         20 |          2        0.02       99.97
         21 |          1        0.01       99.98
         23 |          1        0.01       99.99
         43 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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