Frequencies for first 10,000 rows of pct012k051 variable in sf12010880us30 dataset :

   48 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,014       90.14       90.14
          1 |        775        7.75       97.89
          2 |        140        1.40       99.29
          3 |         45        0.45       99.74
          4 |          8        0.08       99.82
          5 |          9        0.09       99.91
          6 |          4        0.04       99.95
          7 |          1        0.01       99.96
          8 |          2        0.02       99.98
         11 |          1        0.01       99.99
         26 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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