Frequencies for first 10,000 rows of pct012c137 variable in sf12000860us18 dataset :

   30 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,561       85.61       85.61
          1 |        973        9.73       95.34
          2 |        251        2.51       97.85
          3 |         98        0.98       98.83
          4 |         38        0.38       99.21
          5 |         27        0.27       99.48
          6 |         14        0.14       99.62
          7 |         12        0.12       99.74
          8 |          6        0.06       99.80
          9 |          4        0.04       99.84
         10 |          2        0.02       99.86
         11 |          1        0.01       99.87
         12 |          1        0.01       99.88
         13 |          2        0.02       99.90
         22 |          1        0.01       99.91
         25 |          1        0.01       99.92
         26 |          1        0.01       99.93
         33 |          1        0.01       99.94
         41 |          1        0.01       99.95
         45 |          1        0.01       99.96
         47 |          1        0.01       99.97
         58 |          1        0.01       99.98
         75 |          1        0.01       99.99
         83 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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