Google Books Ngram Viewer

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

1800 - 1855 1856 - 1907 1908 - 1920 1921 - 1987 1988 - 2000 on the same track English
1800 - 1967 1968 - 1990 1991 - 1992 1993 - 1997 1998 - 2000 on the same wavelength English

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