Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
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1900 - 1937 1938 1939 1940 - 1990 1991 - 2000 frohe weihnacht German
1900 - 1940 1941 - 1991 1992 - 1995 1996 - 1998 1999 - 2000 frohe weihnachten German
1900 - 1916 1917 - 1919 1920 1921 - 1966 1967 - 1986 fröhliche weihnacht German
1900 - 1916 1917 - 1943 1944 - 1949 1950 - 1994 1995 - 2000 fröhliche weihnachten German

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