Google Books Ngram Viewer

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

1800 - 1926 1927 - 1941 1942 - 1945 1946 - 1993 1994 - 2008 rousseauan English
1800 - 1944 1945 - 1996 1997 - 1999 2000 - 2003 2004 - 2008 rousseauian English
1800 - 1937 1938 - 1995 1996 - 1999 2000 - 2004 2005 - 2008 rousseauvian English
1800 - 1896 1897 1898 - 1964 1965 - 1999 2000 - 2008 rousseaunian English

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