Frequencies for first 10,000 rows of pct012k189 variable in sf12010880us30 dataset :

   82 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,814       98.14       98.14
          1 |        164        1.64       99.78
          2 |         17        0.17       99.95
          3 |          3        0.03       99.98
          4 |          1        0.01       99.99
          6 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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