Frequencies for first 10,000 rows of pct012k045 variable in sf12010880us30 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,173       91.73       91.73
          1 |        654        6.54       98.27
          2 |        122        1.22       99.49
          3 |         32        0.32       99.81
          4 |         11        0.11       99.92
          5 |          1        0.01       99.93
          6 |          3        0.03       99.96
          7 |          2        0.02       99.98
          9 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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