Frequencies for first 10,000 rows of yearest variable in usint dataset :

   Calendar |
    Year of |
   Estimate |      Freq.     Percent        Cum.
------------+-----------------------------------
       1990 |        918        9.18        9.18
       1991 |      1,224       12.24       21.42
       1992 |      1,224       12.24       33.66
       1993 |      1,224       12.24       45.90
       1994 |      1,224       12.24       58.14
       1995 |      1,224       12.24       70.38
       1996 |      1,224       12.24       82.62
       1997 |      1,224       12.24       94.86
       1998 |        412        4.12       98.98
       1999 |        102        1.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Oct 2016