Google Books Ngram Viewer

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

1800 - 1857 1858 - 1897 1898 - 1910 1911 - 1998 1999 - 2008 fatherhood English
1800 - 1902 1903 - 1989 1990 - 1995 1996 - 2001 2002 - 2008 motherhood English
1800 - 1982 1983 - 2000 2001 - 2002 2003 - 2004 2005 - 2008 parenting English

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