Frequencies for first 10,000 rows of cntynat variable in natl1989 dataset :

NCHS County |
         of |
  Occurence |
(100K+ pop) |      Freq.     Percent        Cum.
------------+-----------------------------------
      01008 |        307        3.07        3.07
      01028 |        251        2.51        5.58
      01037 |      2,549       25.49       31.07
      01045 |        644        6.44       37.51
      01049 |        690        6.90       44.41
      01051 |        851        8.51       52.92
      01063 |        555        5.55       58.47
      01999 |      4,153       41.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016