Frequencies for first 10,000 rows of pct012n090 variable in sf12000860us29 dataset :

   87 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,955       99.55       99.55
          1 |         36        0.36       99.91
          2 |          7        0.07       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017