Google Books Ngram Viewer

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

1800 - 1820 1821 - 1944 1945 - 1964 1965 - 1983 1984 - 2000 often English
1800 - 1811 1812 - 1822 1823 - 1862 1863 - 1941 1942 - 2000 oftentimes English

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