Frequencies for first 10,000 rows of year variable in scrace19ages dataset :

       Year |      Freq.     Percent        Cum.
------------+-----------------------------------
       1990 |      8,296       82.96       82.96
       1991 |      1,704       17.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 2 Jan 2018