Frequencies for first 10,000 rows of planexpirationdate variable in plan2016 dataset :

       Plan |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,742       67.42       67.42
 2016-12-31 |      3,108       31.08       98.50
 2017-01-01 |        150        1.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016