Google Books Ngram Viewer

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

1800 - 1851 1852 - 1959 1960 - 1972 1973 - 1987 1988 - 2000 teaching English
1800 - 1813 1814 - 1955 1956 - 1971 1972 - 1986 1987 - 2000 learning English

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