Frequencies for year variable in icd2ccrxhcc1xw2009 dataset :

       Year |      Freq.     Percent        Cum.
------------+-----------------------------------
       2009 |      3,191      100.00      100.00
------------+-----------------------------------
      Total |      3,191      100.00

by Jean Roth , jroth@nber.org , 12 Jan 2016