Google Books Ngram Viewer

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

1800 - 1818 1819 - 1854 1855 1856 - 1962 1963 - 2000 probably rained English
1800 - 1840 1841 - 1943 1944 - 1955 1956 - 1987 1988 - 2000 must have rained English
1800 - 1812 1813 - 1892 1893 - 1895 1896 - 1953 1954 - 2000 certainly rained English

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