Google Books Ngram Viewer

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

1800 - 1830 1831 - 1911 1912 - 1925 1926 - 1974 1975 - 2000 quarters is English
1800 - 1825 1826 - 1884 1885 - 1899 1900 - 1969 1970 - 2000 quarters are English

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