Frequencies for first 10,000 rows of pct012o144 variable in sf12010860us34 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,902       69.02       69.02
          1 |      1,343       13.43       82.45
          2 |        620        6.20       88.65
          3 |        373        3.73       92.38
          4 |        223        2.23       94.61
          5 |        158        1.58       96.19
          6 |        108        1.08       97.27
          7 |         72        0.72       97.99
          8 |         58        0.58       98.57
          9 |         40        0.40       98.97
         10 |         22        0.22       99.19
         11 |         21        0.21       99.40
         12 |         15        0.15       99.55
         13 |         17        0.17       99.72
         14 |          9        0.09       99.81
         15 |          2        0.02       99.83
         16 |          5        0.05       99.88
         17 |          3        0.03       99.91
         18 |          1        0.01       99.92
         19 |          4        0.04       99.96
         21 |          1        0.01       99.97
         26 |          1        0.01       99.98
         30 |          1        0.01       99.99
         40 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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