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

       Year |      Freq.     Percent        Cum.
------------+-----------------------------------
       1990 |        102        1.02        1.02
       1991 |        102        1.02        2.04
       1992 |        102        1.02        3.06
       1993 |        102        1.02        4.08
       1994 |        102        1.02        5.10
       1995 |        102        1.02        6.12
       1996 |        102        1.02        7.14
       1997 |        102        1.02        8.16
       1998 |        102        1.02        9.18
       1999 |        102        1.02       10.20
          . |      8,980       89.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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