Frequencies for first 10,000 rows of pct012n052 variable in sf12000860us29 dataset :

   49 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,472       94.72       94.72
          1 |        392        3.92       98.64
          2 |         70        0.70       99.34
          3 |         21        0.21       99.55
          4 |         13        0.13       99.68
          5 |          5        0.05       99.73
          6 |          7        0.07       99.80
          7 |          2        0.02       99.82
          8 |          3        0.03       99.85
          9 |          4        0.04       99.89
         10 |          1        0.01       99.90
         11 |          1        0.01       99.91
         14 |          3        0.03       99.94
         15 |          2        0.02       99.96
         17 |          2        0.02       99.98
         18 |          1        0.01       99.99
         23 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017