Frequencies for first 10,000 rows of pct012c072 variable in sf12000860us18 dataset :

   69 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,539       95.39       95.39
          1 |        386        3.86       99.25
          2 |         43        0.43       99.68
          3 |         14        0.14       99.82
          4 |          6        0.06       99.88
          5 |          4        0.04       99.92
          6 |          1        0.01       99.93
          7 |          3        0.03       99.96
          8 |          1        0.01       99.97
         10 |          1        0.01       99.98
         11 |          1        0.01       99.99
         30 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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