Google Books Ngram Viewer

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

1800 - 1845 1846 - 1976 1977 - 1985 1986 - 1993 1994 - 2000 two people English
1800 - 1812 1813 - 1824 1825 - 1867 1868 - 1960 1961 - 2000 two persons English

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