Frequencies for first 10,000 rows of planexpirationdate variable in plan2015 dataset :

       Plan |
 Expiration |
       Date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,320       63.20       63.20
 2015-12-31 |      3,566       35.66       98.86
 2016-01-01 |        114        1.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017