Frequencies for first 10,000 rows of dlmp_yy variable in natlterr2014 dataset :

Last Normal |
Menses Year |
  nnnn Year |
    of last |
     normal |
     menses |      Freq.     Percent        Cum.
------------+-----------------------------------
       2012 |         20        0.20        0.20
       2013 |      7,470       74.70       74.90
       2014 |      1,000       10.00       84.90
       9999 |      1,510       15.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016