Google Books Ngram Viewer

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

1750 - 1872 1873 - 1942 1943 - 1950 1951 - 1991 1992 - 2000 weihnachtsbaum German
1750 - 1860 1861 - 1937 1938 - 1945 1946 - 1989 1990 - 2000 christbaum German

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