Google Books Ngram Viewer

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

1980 - 1986 1987 - 1994 1995 1996 - 2005 2006 - 2008 abortion rights English
1980 - 1987 1988 - 1992 1993 1994 - 2003 2004 - 2008 pro choice English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer