Google Books Ngram Viewer

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

1800 - 1865 1866 - 1971 1972 - 1983 1984 - 1995 1996 - 2008 verschlechterung German

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