Frequencies for first 10,000 rows of year variable in nhamcsed2012 dataset :

YEAR (2012) |      Freq.     Percent        Cum.
------------+-----------------------------------
       2012 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016