Frequencies for first 10,000 rows of pct012n144 variable in sf12010880us33 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,194       91.94       91.94
          1 |        499        4.99       96.93
          2 |        139        1.39       98.32
          3 |         75        0.75       99.07
          4 |         25        0.25       99.32
          5 |         13        0.13       99.45
          6 |         14        0.14       99.59
          7 |          5        0.05       99.64
          8 |          6        0.06       99.70
          9 |          4        0.04       99.74
         10 |          2        0.02       99.76
         11 |          2        0.02       99.78
         12 |          1        0.01       99.79
         13 |          3        0.03       99.82
         14 |          4        0.04       99.86
         15 |          2        0.02       99.88
         16 |          3        0.03       99.91
         17 |          2        0.02       99.93
         18 |          1        0.01       99.94
         26 |          1        0.01       99.95
         29 |          1        0.01       99.96
         30 |          1        0.01       99.97
         36 |          1        0.01       99.98
         38 |          1        0.01       99.99
         45 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017