Frequencies for first 10,000 rows of dlmp_yy variable in natlterr2010 dataset :

Last Normal |
   Menses - |
   Year U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
       2008 |          2        0.02        0.02
       2009 |      6,905       69.05       69.07
       2010 |      1,333       13.33       82.40
       9999 |      1,760       17.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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