Google Books Ngram Viewer

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

1800 - 1919 1920 - 1954 1955 - 1960 1961 - 1989 1990 - 2000 be a pal English
1800 - 1918 1919 1920 - 1944 1945 - 1992 1993 - 2000 be my pal English
1800 - 1928 1929 1930 - 1951 1952 - 1991 1992 - 2000 be a pal and English

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