Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1900 - 1943 1944 - 1984 1985 1986 - 1993 1994 - 2008 international economic relations English
1900 - 1983 1984 - 1991 1992 1993 - 2005 2006 - 2008 external sector English

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