Google Books Ngram Viewer

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

1800 - 1860 1861 - 1952 1953 - 1964 1965 - 1990 1991 - 2000 for free English
1800 - 1883 1884 - 1966 1967 - 1978 1979 - 1989 1990 - 2000 free of charge English
1800 - 1814 1815 - 1829 1830 - 1844 1845 - 1959 1960 - 2000 for nothing English

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