Google Books Ngram Viewer

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

1800 - 1831 1832 - 1906 1907 - 1920 1921 - 1971 1972 - 2000 run forward English
1800 - 1836 1837 - 1890 1891 - 1900 1901 - 1966 1967 - 2000 run forwards English
1800 - 1809 1810 - 1820 1821 - 1874 1875 - 1971 1972 - 2000 run backward English
1800 - 1836 1837 - 1930 1931 - 1943 1944 - 1979 1980 - 2000 run backwards English

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