Frequencies for country variable in enfrep20180404 dataset :

      Country |      Freq.     Percent        Cum.
--------------+-----------------------------------
       Sweden |          1        0.66        0.66
  Switzerland |          1        0.66        1.32
United States |        150       98.68      100.00
--------------+-----------------------------------
        Total |        152      100.00

by Jean Roth , jroth@nber.org , 6 Apr 2018