Google Books Ngram Viewer

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

1900 - 1902 1903 1904 - 1915 1916 - 1966 1967 - 2008 ааргау Russian
1900 1901 1902 - 1920 1921 - 1979 1980 - 2008 аргау Russian

Run your own experiment! Raw data is available for download here.
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