Frequencies for first 10,000 rows of pct012n030 variable in sf12000860us29 dataset :

   27 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,236       92.36       92.36
          1 |        472        4.72       97.08
          2 |        147        1.47       98.55
          3 |         55        0.55       99.10
          4 |         22        0.22       99.32
          5 |         16        0.16       99.48
          6 |         15        0.15       99.63
          7 |         12        0.12       99.75
          8 |          2        0.02       99.77
          9 |          3        0.03       99.80
         10 |          2        0.02       99.82
         11 |          5        0.05       99.87
         13 |          2        0.02       99.89
         14 |          1        0.01       99.90
         15 |          2        0.02       99.92
         16 |          1        0.01       99.93
         17 |          1        0.01       99.94
         19 |          1        0.01       99.95
         21 |          1        0.01       99.96
         24 |          1        0.01       99.97
         25 |          1        0.01       99.98
         32 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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