Google Books Ngram Viewer

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

1800 - 1827 1828 - 1860 1861 - 1869 1870 - 1955 1956 - 2008 merry christmas English
1800 - 1836 1837 - 1916 1917 - 1930 1931 - 1992 1993 - 2008 happy holidays English

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