Frequencies for first 10,000 rows of dlmp_yy variable in natlterr2005 dataset :

Last Normal |
   Menses - |
   Year U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
       2003 |          9        0.09        0.09
       2004 |      7,078       70.78       70.87
       2005 |      1,118       11.18       82.05
       9999 |      1,795       17.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015