Frequencies for first 10,000 rows of pct012c159 variable in sf12010860us22 dataset :

   52 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,307       83.07       83.07
          1 |      1,134       11.34       94.41
          2 |        315        3.15       97.56
          3 |        113        1.13       98.69
          4 |         58        0.58       99.27
          5 |         23        0.23       99.50
          6 |         14        0.14       99.64
          7 |          9        0.09       99.73
          8 |          8        0.08       99.81
          9 |          3        0.03       99.84
         12 |          2        0.02       99.86
         13 |          1        0.01       99.87
         15 |          1        0.01       99.88
         17 |          2        0.02       99.90
         19 |          1        0.01       99.91
         20 |          1        0.01       99.92
         27 |          1        0.01       99.93
         33 |          2        0.02       99.95
         49 |          1        0.01       99.96
         52 |          1        0.01       99.97
         60 |          1        0.01       99.98
         61 |          1        0.01       99.99
         72 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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